Answer:
15x - 21
Step-by-step explanation:
-3(-5x+7)
you sidtribute the 3 to both numbers by multiplying both the -5 and the 7 by -3
-3 x -5x = 15x (remember, a negative times a negative equals a positive)
-3 x 7 = -21 (A negative times a positive equals a negative)
15x - 21
In 2016, the cost of 2 ounces of pure gold was $2,640. Complete the double number line to show the cost for 1, 3, and 4 ounces of gold.
Answer:
1 would be 1320
3 would be 3960
4 would be 5280
Step-by-step explanation:
The cost of 1, 3 and 4 ounces of gold in 2016 was $1,320, $3,960 and $5,280 respectively.
Cost of 2 ounces of gold in 2016 = $2,640
Cost of 1 ounce of gold in 2016 = Cost of 2 ounces of gold in 2016 ÷ 2
= $2,640 ÷ 2
= $1,320
Cost of 3 ounces of gold in 2016 = Cost of 1 ounce of gold in 2016 × 3
= $1,320 × 3
= $3,960
Cost of 4 ounces of gold in 2016 = Cost of 1 ounce of gold in 2016 × 4
= $1320 × 4
= $5,280
Therefore, the cost of 1, 3 and 4 ounces of gold in 2016 are $1,320, $3,960 and $5,280 respectively.
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A biker travels the 120 mi from New York , NY to Wilmington, DE in 8 hours. A bus, a truck, and a rider on a horse take the same route as the biker. At what speed does each of them travel if it takes them 2 hours, 2.5 hours, and 18.75 hours respectively to reach Wilmington? Do the speed and the time vary directly or inversely proportional when the same distance is traveled? Explain why.
Answer:
First, remember the relation:
Distance = Speed*Time.
We know that the distance is 120mi.
A) For the biker we know that:
Time = 8hours.
Speed = Distance/Time = 120mi/8h = 15 mi/h.
B) For the bus we know that:
Time = 2 hours.
Speed = Distance/Time = 120mi/2h = 60 mi/h.
C) For the truck we know that:
Time = 2.5 hours.
Speed = Distance/Time = 120mi/2.5h = 48 mi/h.
D) For the rider on a horse we know that:
Time = 18.75 hours.
Speed = Distance/Time = 120mi/18.75h = 6.4 mi/h.
E) The equation for the speed is:
Speed = Distance/Time.
You can see that time is in the denominator, this means that if for a fixed distance, the time increases, then the denominator increases, which would imply that the speed decreases.
Then the speed is inversely proportional to the time when the distance is fixed.
A small school bus contains 8 first-graders and 10 second-graders. If two children are ill, what is the probability that at least one of them is a first-grader?
Answer:
2/18
Step-by-step explanation:
Helppppppp pleaseeeeee
Answer:
this is an unavailable questio. this means the question is being asked wrong. speak to a teacher about this equation.
Step-by-step explanation:
If f(x) = x^2 – 2x and g(x) = 6x + 4, for which value of x does (f + g)(x)=0?
A.-4
B.-2
C. 2
D. 4
Kiran is spending $12 on games and rides at another carnival, where a game costs $0.25 and a ride costs $1.
Write an equation to represent the relationship between the dollar amount Kiran is spending and the number of games, x, and the number of rides, y, he could play/ride. (Note: He is spending all of his money on some unknown combination of games and rides)
Answer:
0.25x + y = 12
Step-by-step explanation:
I am hoping that these steps will be self-explanatory, as I am not quite sure how to explain writing an equation:
0.25x + y = 12
Hope this helps :)
un bulto de frijol contiene 50 kilogramos, Si se reparten una 1/5 a cada persona de un total de 5 ¿Cuántos kilogramos le corresponde a cada uno?
lo necesito para hoy porfa
Simplify rational expression
16 – 4y?
3y2 – 12y + 12
8 + 4y
3y – 6
Which values of y make the expression undefined?
Answer: 8+4y/3y-6. Answer to what makes expression undefined: y=2
Step-by-step explanation:
I apologize for no work but that is what the answers are
Why in the world did I have nearly 800 points worth of questions deleted? Every single one of them were right! What do I do now?
Answer:
read your username :)
Step-by-step explanation:
select all ordered pairs that satisfy the function of y=2/3x+1.
(-3,-1)
(6,4)
(-6,3)
(3,3)
Answer:
A.
Step-by-step explanation:
Plugging in all the values into the equation, only A holds a true statement.
Is d=(10)+(-20) d=10)(5 d=(-35)+(
Answer:
d=7
Step-by-step explanation:
On-the-Go Phone Company has two monthly plans for their customers. The EZ Pay Plan costs $0.20 per minute. The 40 to Go Plan costs $45 per month plus $0.15 per minute. Write an expression that represents the monthly bill for x minutes on the EZ Pay Plan.
Answer:hmm
Step-by-step explanation:
PLEASE HELP!50 POINTS! Brainiest if you know how to do it. I will report you if you're just guessing or very wrong. How do I find the least common denominator in these?
Which of the following is the least common denominator for w-5/w-7 and w+8/3w?
A. 3w (w − 7)
B. w (w − 7)
C. 3w − 7
D. 3(w + 7)
Answer:
A) 3w(w-7)
Step-by-step explanation:
[tex]\frac{w-5}{w-7} and \frac{w+8}{3w}[/tex]
w-7 is a binomial, and 3w is a monomial. Because you cannot put one denominator into the other or multiply both denominators by a number when you have this type of difference where multiplying by a number won't get you the same result, you must multiply them each other.
Therefore:
3w(w-7) would be your LCD.
Answer:
A. 3w (w − 7)Step-by-step explanation:
GivenFractions
(w- 5)/(w-7) and (w + 8)/3wTo findCommon denominatorSolutionWe observe that the fractions can't be simplified any more and they are in the simplest form
Next, the denominators w - 7 and 3w don't have common factors
Therefore the common denominator is the product of denominators:
3w(w - 7)Correct option is A
Write an equation in slope-intercept form for the line that has a slope of -1/3 and passes through (-6,1)
Answer:
Step-by-step explanation:
which one is the unit of force
A.Joules
B. Newton
C. Celsius
D. Kelvin
Answer:
Newtons
Step-by-step explanation:
Joules measure electrical power and celcius and Kelvin measures temperature.
HELP NEEDED!!!!
Liliana and Marcus are playing a word game. Liliana spells a word incorrectly and loses 18 points. Then Marcus spells a word correctly and has the opposite score. Which is the correct way to represent "the opposite of Liliana's score is equal to Marcus's score"?
A)-18 = 18
B)-(-18) =-18
C)-(18)=-18
D)-(-18)=18
(the answer is not C)
Answer:
D
Step-by-step explanation:
Wkx2di2jd1nd1do jf2kd2ifj2dkdu2dj2d
Answer:
d
Step-by-step explanation:
If tan(x)=3/5 and sin(x)>0, what is sin(2x)?
With STEPS PLEASE AND NO TROLLING.
i edited the answer. hope it helps. if it isn't ryt tell me plz
Answer:
sin2x = [tex]\frac{30}{34}[/tex]
Step-by-step explanation:
Given
tanx = [tex]\frac{3}{5}[/tex] = [tex]\frac{opposite}{adjacent}[/tex]
This is a right triangle with legs 3 and 5
Let the hypotenuse be h , then using Pythagoras' identity
h² = 3² + 5² = 9 + 25 = 34 ( take the square root of both sides )
h = [tex]\sqrt{34}[/tex]
Thus
sinx = [tex]\frac{opposite}{hypotenuse}[/tex] = [tex]\frac{3}{\sqrt{34} }[/tex]
cosx = [tex]\frac{adjacent}{hypotenuse}[/tex] = [tex]\frac{5}{\sqrt{34} }[/tex]
Hence
sin2x = 2sinxcosx = 2 × [tex]\frac{3}{\sqrt{34} }[/tex] × [tex]\frac{5}{\sqrt{34} }[/tex] = [tex]\frac{2(3)(5)}{\sqrt{34}(\sqrt{34}) }[/tex] = [tex]\frac{30}{34}[/tex]
******Absolute Value******
l-7al=28
Answer:
a = 4
Step-by-step explanation:
28/ 7 = 4
l7al= 28
7x4 = 28
Absolute Value: the magnitude of a real number without regard to its sign.
plz mark brainliest
Answer:
a=-4
Step-by-step explanation:
-7a=28
7a/7=-28/7
a=-4
PLZ HELP!!
The function c(x) = 2.5x + 15 shows the cost, in dollars, to make x necklaces.
What is c(10)?
What is c(15)?
What is the best interpretation of c(20) = 65 in terms of the problem?
Answer:
c(10)=40
c(15)=52.5
Step-by-step explanation:
c(10) means you plug 10 into your x same with (c15) you plug in 15 so for c(10) it would be 2.5(10) + 15 which is 40
The value of c(10) and c(15) is 40 and 65 respectively.
The given function is c(x) = 2.5x + 15.
What is the function?A function is defined as a relation between a set of inputs having one output each. In simple words, a function is a relationship between inputs where each input is related to exactly one output. Every function has a domain and codomain or range. A function is generally denoted by f(x) where x is the input.
Now, c(10)=2.5(10)+15=40
c(15)=2.5(15)+15=52.5
Given c(20) = 65
So, 65=2.5x+15
⇒50=2.5x
⇒x=20
Therefore, the value of c(10) and c(15) is 40 and 65 respectively.
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The _____ is used to compare values that are proportional.
The Proportionality Constant is used to compare values that are proportional.
What is the meaning of Proportionality ?When two variables are proportional to each other , change in one cause the change in the other .
There are two types of proportion, Direct and Indirect.
When on increasing one variable the other increases and vice versa it is called direct proportion .
When on increasing one variable the other decreases and vice versa it is called indirect proportion .
In the given question
The _____ is used to compare values that are proportional.
The Proportionality Constant is used to compare values that are proportional.
suppose
a ∝ b
a = kb
here k is the Proportionality Constant and is used to compare the values.
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Please and thank you
Answer:
C. The Function is positive when x<0 and when x>0.
Hope this helps! :)
The ratio of books
to magazines in the
children's section at the
library is 5-2. If there
are 225 books, calculate
the number of
magazines.
50 magazines
because ratio is division and 225/5 is 25 and you multiply the 2 by 25 and you get 50
There are 64 magazines in the library.
What is mean by Ratio?A ratio indicates how many times one number contain in another number. The ratio of two number is written as x : y, which is equivalent to x/y. Where, x and y are individual amount of two quantities. And, Total quantity gives after combine as x + y.
We have to given that;
The ratio of books to magazines in the children's section at the library is 5: 2.
Let number of books = 5x
And, Number of magazines = 2x
Here, There are 225 books in the library.
Hence, We can formulate;
⇒ 5x + 2x = 225
⇒ 7x = 225
⇒ x = 32
Hence, Number of magazines = 2x
= 2 × 32
= 64
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Find the inverse function of
y =x-5/6
[tex]f(x) = y = x - \frac{5}{6} \\ [/tex]
Subtract the sides of the equation plus 5/6
[tex]y + \frac{5}{6} = x \\ [/tex]
So ;
[tex] {f}^{ - 1}(x) = x + \frac{5}{6} \\ [/tex]
_________________________________
And we're done.
Thanks for watching buddy good luck.
♥️♥️♥️♥️♥️
How do you change -3 in x^-3 to be positive?
Answer:
x^-3=1/x^3
This is how we do it.
Answer:
Take the reciprocal. 1/x^3
Step-by-step explanation:
When you take the reciprocal of a number or a variable, the exponent changes sign.
Tell me two(2) things you know about the pink line?
Answer:
it's pink in colour
it's a line
it is a linear line and it has a negative value as the line is decreasing from left to right.
the lines represented by the equations 25y-10x=200 and 5y+2x=40 are
Answer:
The slope
Step-by-step explanation:
Between which two consecutive whole numbers does 17 lie?
Mariane buys 16 bags of potting soil for her father that comes in 3/4 pound bags. Part 1 How many pounds of potting soil does Marianne buy? Use the drop downs to put the correct number into the box to complete the statement. If Marianne's father calls and says he needs 15 pounds of potting soil, how many additional bags should she buy? Use the drop downs to put the correct number into the box to complete the statement.
Answer:
Additional bags required = 4
Step-by-step explanation:
Marianne buys number of bags of potting soil = 16
Each bag weighs = [tex]\frac{3}{4}[/tex] pounds
Total weight of 16 soil bags = [tex]16\times \frac{3}{4}=12[/tex] pounds
If Marianne's father requires potting soil = 15 pounds
Amount of additional soil he will require = 15 - 12
= 3 pounds
Therefore, number of additional soil bags required = [tex]\frac{\text{Weight of soil required}}{\text{Soil in each bag}}[/tex]
= [tex]\frac{3}{\frac{3}{4}}[/tex]
= [tex]3\times \frac{4}{3}[/tex]
= 4 bags
Additional bags required by Marianne= 4
9. The amount of money Allen earns varies directly with the amount of time he works. He earns
$19 for working 2 hours. How much can Allen earn if he works 5 hours?
Step-by-step explanation:
you must do by unitary methods, first find smaller quantity and then multiply with remaining one.
what is y when the equation is x^2 - 3xy -4y^2 =0
Answer:
y = 1/8 (5 sqrt(x^2) - 3 x) or y = 1/8 (-3 x - 5 sqrt(x^2))
Step-by-step explanation:
Solve for y:
-4 y^2 - 3 x y + x^2 = 0
Hint: | Multiply both sides by a term to make the coefficient of y^2 positive.
Multiply both sides by -1:
4 y^2 + 3 x y - x^2 = 0
Hint: | Using the quadratic formula, solve for y.
y = (-3 x ± 5 sqrt(x^2))/8:
Answer: y = 1/8 (5 sqrt(x^2) - 3 x) or y = 1/8 (-3 x - 5 sqrt(x^2))