Answer:
[tex]8+i[/tex]
Step-by-step explanation:
We are given that an expression
[tex]6i^4+6i^3-2i^2+\sqrt{-49}[/tex]
We have to rewrite in the form of a+bi
[tex]6(i^2)^2+6i^3-2i^2+\sqrt{-49}[/tex]
We know that
[tex]i^2=-1[/tex]
[tex]i^3=-i[/tex]
[tex]\sqrt{-1}=i[/tex]
Using the identity
Then, we get
[tex]6-6i-2(-1)+7i[/tex]
[tex](6+2)+(7-6)i[/tex]
[tex]8+i[/tex]
This is required form of a+ib
The following options are available for a car wash
Standard wash £8
Deluxe wash £12
In one day 60 customers have their car washed. The ratio of customers choosing the standard car wash to those choosing the deluxe car wash is 3:2
What is the total takings at the car wash for the day?
Answer:
£576
(would really, reallly appreciate the brainliest)
Step-by-step explanation:
8 * 60 * 3/5 + 12 * 60 * 2/5
Subtract and write in standard form
(8x – 6x3 + 5x2) - (2x2 + 2x - 7x3)
Answer:
x^3 +3x^2 +6x
Step-by-step explanation:
Eliminate parentheses using the distributive property. Collect terms. Standard form has the exponents decreasing.
= 8x -6x^3 +5x^2 -2x^2 -2x +7x^3
= x^3(-6 +7) +x^2(5 -2) +x(8 -2)
= x^3 +3x^2 +6x
Use the given values of n and p to find the minimum usual value μ - 2σ and the maximum usual value μ + 2σ.
n = 2136, p = 3/7
Answers:
1. Minimum: 843.1; maximum: 987.75
2. Minimum: 961.17; maximum: 869.69
3. Minimum: 892.56; maximum: 938.3
4. Minimum: 869.69; maximum: 961.17
Answer:
[tex] \mu -2\sigma = 915.428 - 2* 22.87=869.69[/tex]
[tex] \mu +2\sigma = 915.428 + 2* 22.87=961.17[/tex]
And the best option would be:
4. Minimum: 869.69; maximum: 961.17
Step-by-step explanation:
We can assume that the variable of interst X is distributed with a binomial distribution and we can use the normal approximation.
For this case the mean would be given by:
[tex] E(X) = np = 2136 *(\frac{3}{7})= 915.428[/tex]
And the standard deviation would be:
[tex] \sigma = \sqrt{2136*(\frac{3}{7}) (1-\frac{3}{7})} =22.87[/tex]
And if we find the limits we got:
[tex] \mu -2\sigma = 915.428 - 2* 22.87=869.69[/tex]
[tex] \mu +2\sigma = 915.428 + 2* 22.87=961.17[/tex]
And the best option would be:
4. Minimum: 869.69; maximum: 961.17
What is the circumference of the circle? Use 3.14 for Pi. A circle with radius 6.4 centimeters.
Answer:
C≈40.21cm
Step-by-step explanation:
Answer:
40.192
Step-by-step explanation:
the radius is half of the diameter so the diameter is 12.8 now 12.8 times pi / 3.14
A bakery sold 100 mocha cupcakes in a day, which was 20% of the total number of cupcakes sold that day. How many total cupcakes did the bakery sell that day?
Answer:
500
Step-by-step explanation:
percentage is the quantitative way to express number of things out of 100 things.
For example : 20% of bananas are ripe.
it means that if there are 100 apples, 20 are ripe.
Let the total number of cupcakes sold that day be X
20% of total number of cupcakes sold = 20% of X = (20/100) * X __1
It is given that 20% of total number of cupcakes sold is equal to 100
Thus the equation 1 should be equal to 100.
Writing it mathematically we have
(20/100) * X = 100
=> 0.2X = 100
=> X = 100/0.2 = 500
500 cupcakes did the bakery sell that day.
x2 + y2 + 10x + 12y + 25 = 0
What is the center of this circle ?
What is the radius of this circle ?
units
Answer:
Center (- 5, - 6)
Radius 6 units
Step-by-step explanation:
x² + 10x + y² + 12y + 25 = 0
x² + 2*5*x + 5² + y² + 2*6*y + 6² - 5² - 6² + 25 = 0
(x + 5)² + (y + 6)² - 6² = 0
(x + 5)² + (y + 6)² = 6²
Center (- 5, - 6)
Radius 6 units
59 people showed up to the party. There were 3 less men than women present. How many men were there?
Answer:
28 MEN
Step-by-step explanation:
X + X-3=59
2X-3=59
2X=62
X=31
MEN=31-3=28
This month you earned 8% more than last month write two different expressions to show this
Answer:
X+8/100x ; X+0.08x
Step-by-step explanation:
Let x = last month's earning
8% =8/100 or 0.08
8/100 of x= 8/100x 008 of x=0.08x
last month + 8/100 of last month:
x+8/100x
last month + 0.08 of last month:
x+0.08x
Those are your two answers. I am sorry if they are wrong. I am not the best at math, but I tried supplying the answers as best as I could.
PLEASE ANSWER ASAP! WILL GIVE ~BRAINLIEST~ ANSWER (IF CORRECT)
Rewrite the expression in the form 9^n
9^7/9^5
Answer:
a^b/a^c = a^b-c
9^7/9^5=9^7-5
=9^2 ( ANSWER )
Step-by-step explanation:
please mark me BRAINLIEST
Determin The Constant of proportionality
l varies derectly as h; when l = 112,h = -16
Answer:
-7
Step-by-step explanation:
l = kh . . . . . l is proportional to h with proportionality constant k
112 = k·(-16) . . . . . . use the given numbers
k = -112/16 = -7 . . . divide by the coefficient of k
The constant of proportionality is -7.
Which expression is equivalent to (sf)(6)
Answer:
(st)(6)= s(6) * t(6)
Step-by-step explanation:
(st)(6)
(st)(x)= s(x) * t(x) we multiply it
(st)(6)= s(6) * t(6)
Hope this helps.
The Community College Survey of Student Engagement reports that 46% of the students surveyed rarely or never use peer or other tutoring resources. Suppose that in reality 40% of community college students never use tutoring services available at their college. In a simulation, we select random samples from a population in which 40% do not use tutoring. For each sample, we calculate the proportion who do not use tutoring. If we randomly sample 100 students from this population, the standard error is approximately 5%. Would it be unusual to see 46% who do not use tutoring in a random sample of 100 students?a) Yes, this would be unusual because 46% is more than one standard error from the mean. It is very rare for a sample to be more than one standard error from mean. b) Yes, this would be unusual because 46% is 6% higher than 40%. c) No, this would not be unusual because the error is only 6%. d) No, this would not be unusual because 46% is only 1.2 standard errors from 40%.
Answer:
d) No, this would not be unusual because 46% is only 1.2 standard errors from 40%.
Step-by-step explanation:
Problems of normally distributed samples are solved using the z-score formula.
In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the zscore of a measure X is given by:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
If the z-score is higher than 2 or lower than -2, X is unusual.
In this question:
Mean = 40%. So [tex]\mu = 0.4[/tex]
Standard error = 5%. So [tex]\sigma = 0.05[/tex]
Is 46% unusual?
We have to find Z when X = 0.46. So
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
[tex]Z = \frac{0.46 - 0.4}{0.05}[/tex]
[tex]Z = 1.2[/tex]
1.2 is lower than 2, that is, it is only 1.2 standard deviations from the mean. So 46% is not unusual.
So the correct answer is:
d) No, this would not be unusual because 46% is only 1.2 standard errors from 40%.
PLS HELP ASAP twenty points Find the value of c such that the expression is a perfect square trinomial.
x^2-14x+c
Answer:
49
Step-by-step explanation:
x^2-14x+c
Take the coefficient of x
-14
Divide by 2
-14/2 = -7
Square it
(-7)^2
49
This is the number you add
Use the definition of continuity and the properties of limits to show that the function
f(x) = x2 + 5(x - 2)7 is continuous at x = 3.
Answer:
Applied the definition and the limit.
They had the same result, so the function is continuous.
Step-by-step explanation:
At function f(x) is continuous at x = a if:
[tex]\lim_{x \to a} f(x) = f(a)[/tex]
In this question:
[tex]f(x) = x^{2} + 5(x-2)^{7}[/tex]
At x = 3.
[tex]\lim_{x \to 3} x^{2} + 5(x-2)^{7} = 3^{2} + 5(3-2)^{7} = 14[/tex]
[tex]f(3) = 3^{2} + 5(3-2)^{7} = 14[/tex]
Since [tex]\lim_{x \to 3} f(x) = f(3)[/tex], f(x) is continuous at x = 3.
Find the equation for the line that passes through the point
(−3,−1) and that is parallel to the line with the equation
y=1/2x-3
Answer:
work is shown and pictured
For a function p(x), as — then p(x) — 4. Which of the following graphs
could be p(x)?
ANYONE PLZZZ THIS IS DUE IN AN HOUR. Will mark the brainliest
Answer:
0.96 in^3
Step-by-step explanation:
Are those the only three choices? Anyway, I hope this helps
ASAP! GIVING BRAINLIEST! Please read the question THEN answer correctly! No guessing.
Answer:
Step-by-step explanation:
f(x) = x^2
reflect along the x-axis
g(x) = -x^2
expand vertilcally by a factor of 1/3
g(x) = (-1/3) x^2
move horizontally 4 units to the left
g(x) = (-1/3) (x+4)^2
hope this helps
Answer:
B. The graph of G(x) is the graph of F(x) stretched vertically, flipped over the x-axis, and shifted 4 units to the left.
Step-by-step explanation:
The [tex]\frac{-1}{3}[/tex] is less than one, making it stretch wider, and the (-) made it flip over the x-axis. The +4 in [tex](x+4)^2[/tex] made the function on the graph shift 4 units to the left.
This makes the correct answer be "B."
What's the answer please?
Answer:
1. 3
2. 2
3. 6
Step-by-step explanation:
1. 3 * 3 = 9
2. 5 - 2 = 3
3. 3 + 6 = 9
what is the mean of :20 20 20 22 22 24 26 26 26
The mean of a set of numbers is the sum divided by the number of terms.
Answer: 22.9
Answer:
YOU ADD AND DIVIDE FOR THE MEAN
Step-by-step explanation:
add 20 + 20 + 20 + 22 + 22 + 24 + 26 + 26 + 26 equaling to = 206
divide by 9 equaling to = 22.88
5,-5/2,5/4,-5/8 what is the 5th term
Answer: your answer would be 5/16th :)
Answer:
5/16
Step-by-step explanation:
The common ratio is -5/2 / 5 = -1/2
Xn = 5 × (-1/2)^(n-1)
X5 = 5 × (-1/2)^(5-1)
X5 = 5 × (-1/2)^(4) = 5/16
The radius of the circle below intersects the unit circle at ( 3/5 • 4/5 What is the approximate value of e?
Answer:
12/25
Step-by-step explanation:
multiply the fractions.
multiply the numbers.
You have $125 in a savings account and you deposit an equal amount into your account each week. After 5 weeks the account holds $170. Write an equation that represents the amount y
(in dollars) of money in the account after x
weeks.
Answer:
The answer is 9
Step-by-step explanation:
if u 170-125= 45 then u divide 5 into 45 and u get 9
A school survey asked students which candidate they supported for class president. The survey data are shown in the relative frequency table. What percentage of females polled supported Wilson?
Answer:
D about 44%
Step-by-step explanation:
just took the tests
Using the percentage concept and the given table, it is found that about 39% of males supported Wilson.
What is a percentage?
The percentage of an amount a over a total amount b is given by a multiplied by 100% and divided by b, that is:
[tex]P=\frac{a}{b}\times 100%[/tex]
In this problem, males are 46% of the sample, and 18% are males that supported Wilson,
[tex]P=\frac{18}{46} \times 100=39[/tex]
About 39% of males supported Wilson.
To learn more about the percentage of visit:
https://brainly.com/question/24304697
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if 9 more than twice a number is 3 less than three times the same number, what is the number?
Answer:
the number is 12
Step-by-step explanation:
9+2x=3x-3
9+3=3x-2x
12=x
The required number is 12.
What are linear equation?A linear equation only has one or two variables. No variables in a linear equation is raised to power greater than 1 or used as denominator of a fraction.
Now it is given that,9 more than twice a number is 3 less than three times the same number.
Let the number be x.
So, 9 more than twice a number = 9 +2x
and, 3 less than three times the same number = 3x - 3
Hence we have,
9 + 2x = 3x - 3
Adding 3 both the side we get,
12 + 2x = 3x
Now substracting 2x both the side we get,
x = 12
Hence the number is 12.
More about linear equation :
https://brainly.com/question/16584198
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There were 128 participants in an online Fortnite tournament. The table below shows the number of people that were left in the tournament after each round. After each round the # decreases. Round 1=64,2=32,3=16,4=8. Determine how many more rounds until there’s a winner & explain
Answer:
7 rounds
Step-by-step explanation:
After the 5th round, 8 divide by 2 equals 4. After the 6th round, 4 divided by 2 equals 2. After the 7th round, 2 divided by 2 equals 1 determining a winner. After every round, the number of people is decreased by dividing by 2.
Hope this helps!!! PLZ MARK BRAINLIEST!!! GG’s
mary had 1 3/4 pound of blackberries. Mary's friend ate 3/4 of the blackberries. How many pounds of blackberries did Mary friend eat?
Answer:
Shown in the explanation below,
Step-by-step explanation
Mary had 1 3/4 pounds
Mary friend eat 3/4 blackberry which is
3/4. × 7/4 = 21/ 16 = 1 5/16
What is 841,487 rounded to the nearest ten thousand?
Answer:
840,000
Step-by-step explanation:
841,487 sice the ten thousands place is under the number five you round down to 840,000
A new screening test for Lyme disease is developed for use in the general population. The sensitivity and specificity of the new test are 60% and 70%, respectively. Three hundred people are screened at a clinic during the first year the new test is implemented. Assume the true prevalence of Lyme disease among clinic attendees is 10%.
Calculate the following values:
The predictive value of a positive test
The predictive value of a negative test
Answer:
predictive value of a positive test = 18.18%
predictive value of a negative test = 94.03%
Step-by-step explanation:
Sensitivity = 60% = 0.6
Specificity = 70% = 0.7
Let True Positive = TP
True Negative = TN
False Negative = FN
[tex]Sensitivity = \frac{TP}{TP + FN} \\0.6 = \frac{TP}{TP + FN} \\0.6TP + 0.6FN = TP\\0.4TP = 0.6FN\\TP = 1.5 FN[/tex]
[tex]Specificity = \frac{TN}{TN + FP} \\0.7 = \frac{TN}{TN + FP} \\0.7TN + 0.7FP = TN\\0.7FP = 0.3 TN\\TN = 7/3 FP[/tex]
Prevalence = 10% = 0.1
Three hundred people are screened, [tex]T_{total} = 300[/tex]
Total number of people having the disease, [tex]T_{disease} = ?[/tex]
[tex]Prevalence = \frac{T_{disease} }{T_{total} } \\0.1 = \frac{T_{disease} }{300 }\\T_{disease} = 30[/tex]
[tex]T_{disease} = TP + FN\\30 = TP + FN[/tex]
But TP = 1.5 FN
30 = 1.5 FN + FN
30 = 2.5 FN
FN = 30/2.5
FN = 12
TP = 1.5 FN = 1.5 * 12
TP = 18
[tex]FP + TN = T_{total} - T_{disease} \\FP + TN = 300 - 30\\FP + TN = 270\\FP + \frac{7}{3} FP = 270\\\frac{10}{3} FP = 270\\FP = 27 * 3\\FP = 81[/tex]
81 + TN = 270
TN = 189
To calculate the Predictive value of positive test (PPT)
[tex]PPT = \frac{TP}{TP + FP} * 100\\PPT = \frac{18}{18+81} * 100\\PPT = \frac{18}{99} * 100\\PPT = 18.18 \%[/tex]
To calculate the Predictive value of negative test (PNT)
[tex]PPT = \frac{TN}{FN + TN} * 100\\PPT = \frac{189}{189+12} * 100\\PPT = \frac{189}{201} * 100\\PPT = 94.03 \%[/tex]
A jar is 25 filled with water. If 750 ml more water is poured into the jar, it becomes full. What is the capacity of the jar?
Answer:
775 ml
Step-by-step explanation:
Answer:
775
Step-by-step explanation:
25 plus 50 equals 75.700 plus 75= 775 ml.