Answer:
Amount of Niobium-91 initially
= 300/91 =3.2967mol
2040 years = 3 ×680 = 3 half-lives
therefore, amount left = 0.4121mol
mass of Niobium-91 remaining = 0.4121 ×91 =37.5g
Please give brainliest
Is it Zero or undefined?
Answer:
0
Step-by-step explanation:
When trying to solve this we have only y left over. if we only have the slope for y it is 0. if we only have the slope for x it is undefined.
Pls tell me if it is wrong
If it is I am sorry
Simplify each expression.
8(x-4)
-(x-3)
4(x + 3y + 1)
Helppppppp
Answer:
8(x-4)
8x-32
-(x-3)
-x+3
4(X+3y+1)
4x+12y+4
Step-by-step explanation:
I am not to sure about the 2nd one tho
Does the graph represent y as a function of x?
Answer:
No this is not a function
Step-by-step explanation:
If you use the vertical line test which is just a line used across the graph. If we can draw any vertical line that intersects a graph more than once then it is not a function.
yall i need help its de in 30mins!!
Answer:
I can solve partial
Step-by-step explanation:
Given that,
Diameter of semicircle= 5m
Radius= 2.5m
Now,
Perimeter= πr
=3.14×2.5
= 7.85
Solve for x.
|x =
x = 8
If there is more than one solution, separate them with commas.
If there is no solution, click on "No solution".
X =
No
solution
X Х
?
9514 1404 393
Answer:
x = -8, 8
Step-by-step explanation:
The argument of the absolute value function can be positive or negative to give the same result.
|-8| = 8 ⇒ x = -8
|8| = 8 ⇒ x = 8
The possible solutions are x = -8, 8.
A graph of a quadratic function is shown on the grid.
Which coordinates best represent the vertex of the graph?
A. (2, -1)
B. (1, 0)
C.(3, 0)
D.(0, 3)
which is larger -17/24 or -11/12
Answer:
-17/24
Step-by-step explanation:
Because they are negative numbers, the smaller fraction (when disregarding the negative sign) is always a larger number. -11/12 could be changed to -22/24, and therefore since it is a larger number when disregarding the negative (22/24), it is a smaller number altogether.
-17/24 > -22/24
Tina got $500 for their 20th birthday and invested it in an account earning 1.5% interest compounded annually. Write and solve an exponential equation to determine how long it will take Tina's investment to grow to $800
What are 2 numbers that add to 40 and subtract to 10
Answer:
25 and 15
Step-by-step explanation:
let the 2 numbers be x and y , x > y , then
x + y = 40 → (1)
x - y = 10 → (2)
add the 2 equations term by term to eliminate y
2x + 0 = 50
2x = 50 ( divide both sides by 2 )
x = 25
substitute x = 25 into (1)
25 + y = 40 ( subtract 25 from both sides )
y = 15
the 2 numbers are 25 and 15
Find the slope of JK←→ and LM←→−. Then determine whether the two lines are parallel, perpendicular, or neither.
J(1, 9), K(7, 4), L(8, 13), M(-2, 1)
m(JK) =
m(LM) =
Parallel, Perpendicular, or Neither:
perpendicular"
Step-by-step explanation:
We need to find slope (m) of both line JK and LM
Slope has formula:
Lets find slope of JK:
Lets find slope of LM:
we know if we multiply two lines' slope and get -1, they are perpendicular. Let's check:
Hence, they are perpendicular
Ava bought a rectangular rug for her hallway. The rug is 23 yards wide and 234 yards long. What is the area of the rug?.
Answer:
5,382 yards
Step-by-step explanation:
To find the area, just multiply the width and length together. Don't forget the unit!!
Please help I think I have an idea as to what it is but I think somethings off with what I got (Due in 8 minutes!! have a blessed day/night)
Answer:
i think its 13 im not too sure. Im not that good at math
Step-by-step explanation:
What is the scale factor from ABC to XYZ?
6
scale factor:
new image ÷ original image
Here:
24 ÷ 4 = 618 ÷ 3 = 630 ÷ 5 = 6Answer: A: 6
Step-by-step explanation:
A tennis ball is dropped from a height of 12 meters. Each time the ball bounces back to 80% of the height from which it fell. Draw a graph to represent the height of the ball after each bounce.
Please help me
Lance has 3 time as many pencils as Nick, and they have 84 pencils together. How many pencils does each of them have?
Answer:
21 pencils for Nick and 63 pencils for Lance
Step-by-step explanation:
Lance is said to have 3 times the pencils Nick has.Let's keep the number of pencils Nick has as x.If Nick has x pencils that means Lance has 3x pencils. The total number of pencils present is 84.Now let's make an equation out of the information above:
3x + x = 84
Now solve for x.
3x + x = 84
4x = 84
x = 84/4
x = 21
So Nick has 21 pencils
Now for Lance:
3x
3 * (21) = 63
So Lance has 63 pencils
63 + 21 = 84 pencils
Maya runs 7 miles in 50 minutes. At the same rate, how many miles would she run in 75 minutes
Answer:
10.5 miles
Step-by-step explanation:
Point (2, 4) is reflected across the x-axis. What are
the coordinates of its image?
Answer:
The coordinates of its image are (2, -4)
Step-by-step explanation:
Let us revise the rules of reflection across the axes
If the point (x, y) reflected across the x-axis, then its image is (x, -y), the rule of reflection is rx-axis (x, y) → (x, -y) If the point (x, y) reflected across the y-axis, then its image is (-x, y), the rule of reflection is ry-axis (x, y) → (-x, y)∵ The point (2, 4) is reflected across the x-axis
→ By using the first rule above rx-axis (x, y) → (x, -y)
∴ Change the sign of its y-coordinate
∴ Its image is (2, -4)
∴ The coordinates of its image are (2, -4)
Select two ratios that are equivalent to 2:9, colon, 9. Choose 2 answers:
Answer:
4:18 and 6:27
Step-by-step explanation:
Answer:
the correct answer is option b and c
3 times x plus 4 is greater than or equal to 4 times the sum of x and 1. (Hint: 4 times the sum means you should write a distributive property problem)
Given:
3 times x plus 4 is greater than or equal to 4 times the sum of x and 1.
To find:
The inequality for the given statement and solution of the inequality.
Solution:
4 times the sum means a distributive property problem.
Now,
3 times x : 3x
3 times x plus 4 : 3x+4
Greater than or equal to : ≥
4 times the sum of x and 1 : 4(x+1)
So, the inequality is
[tex]3x+4\geq 4(x+1)[/tex]
Using distributive property, we get
[tex]3x+4\geq 4x+4[/tex]
Isolate variable terms.
[tex]4-4\geq 4x+3x[/tex]
[tex]0\geq x[/tex]
It can be written as
[tex]x\leq 0[/tex]
Therefore, the required inequality is [tex]3x+4\geq 4(x+1)[/tex] and the solution is [tex]x\leq 0[/tex].
If i have 10 dogs and 5 of them went away the mother dog had 10 more than she had before then 3 of them went away and she will get 5 more than she had before. How many dogs does she have ?
Answer:
This problem is asking the question below:
What is 10-5+10-3+5
10-5=5
5+10=15
15-3=12
12+5=17
So, the mother dog had a total of 17 pups
Step-by-step explanation:
Hope this helps! :)
Have a blessed day! :)
PLEASE MARK ME AS BRAINLIEST I REALLY WANT TO LEVEL UP
Please answer correctly !!!!!!!!!!!!!! Will mark brainliest !!!!!!!!!!!!!!!!!!
Answer:
bc=12x
ab=17
ac=141
Step-by-step explanation:
In a bird sanctuary, 30% of the birds are
hummingbirds. If there are about 350 birds in
the sanctuary at any given time, how many are hummingbirds?
Answer: 105 of them are hummingbirds.
Step-by-step explanation:
I there are a total of 350 birds then 30% o 350 will give the number o hummingbirds.
350 of 30%
350 * 0.3 = 105
please HELP ME!!!!! asap
Answer:
She should ski on Slope B because it is steeper
Step-by-step explanation:
Slope B is steeper than Slope A, so she should ski on Slope B.
First, you must find common multiples for the denominator.
[tex]\frac{15}{24}=\frac{30}{48}[/tex] slope A
[tex]\frac{12}{16}=\frac{36}{48}[/tex] slope B
Slope B has a higher vertical feet per 48 horizontal feet, so slope B is steeper.
grete waitz won the new york marathon nine times. The rate at which she ran during her last victory in 1988 was 26 miles in 148 minutes. to the nearest hundredth, what was the unit rate for her last race.
Answer
148/26 = 5.69 min/mile
Step-by-step explanation:
Unit rate miles per minute = 26/148 = 0.175= 0.176 miles per minute (rounded)
If you want minutes per mile 148/26 = 5.69 min/mile
729,646 __ 729,054
LESS OR GREATER OR EQUAL.
Answer:
729,646 > 729,054
Which property is x/5=3 pls helppp
Answer:
It means that the value of X is 15
X/5=3/1
or,X=3×5
or,X=15
Answer:
value of X is 5 ani if there was y then it would be vaule of y
Samantha withdrew $160 from her bank account.if the balance of the account is now 379.52 what was her balance before the withdraw
Answer:
It was $539.52
Step-by-step explanation:
Answer:
$539.52
Step-by-step explanation:
Larry started out the week in a new job. He was paid $10 to attend job orientation.
After that he made $6.25 per hour for each hour he worked. Write the equation in
slope-intercept form that represents the equation.
Answer:
y=6.25x+10
Step-by-step explanation:
6.25 is the rate of change so it is the slope. 10 is what you start with so it is the y- intercept
At the beginning of the year, John had $40 in savings and saved an additional $13 each week thereafter. Isaac started the year with $80 and saved $9 every week. Let 'J' represent the amount of money John has saved tt weeks after the beginning of the year and let 'I' represent the amount of money Isaac has saved tt weeks after the beginning of the year. Write an equation for each situation, in terms of t, and determine the number of weeks after the beginning of the year until John and Isaac have the same amount of money saved.
Answer:
10 weeks
Step-by-step explanation:
Let’s replace ‘t’ with numbers going up starting from 0 on both sides of the equation. Repeat until you get to 10 and you see that both are equal at $170 has been saved after 10 weeks.
John’s equation: 40 (y intercept) + 13t (saved per week)
Issac’s: 80 (y intercept) + 9t (amount saved per week)
The y-intercept represents the amount of money already saved up.
A recycling bin is shaped like a trapezoid. The bottom 2 angles are 108 degrees. The top left angle is 72 degrees. The front view of a recycle bin is shaped like a trapezoid. What is the measure of the remaining angle? 72° 144° 198° 252°.
The measure of the remaining angle is 72 degree, the correct option is A.
What is the trapezoid?A trapezoid, also known as a trapezium, is a flat closed shape having 4 straight sides, with one pair of parallel sides.
Given
A recycling bin is shaped like a trapezoid.
The bottom 2 angles are 108 degrees.
The top left angle is 72 degrees.
The front view of a recycle bin is shaped like a trapezoid is given by;
[tex]\rm \angle 1+ \rm \angle 2+ \rm \angle 3+ \rm \angle4= 360\\\\108+108+72\rm +\angle 4=360\\\\\rm 288+\angle 4 = 360 \\\\\rm \angle 4=360-288\\\\\rm \angle 4=72[/tex]
Hence, the measure of the remaining angle is 72 degree.
To know more about trapezoid click the link given below.
https://brainly.com/question/3319408
Answer: A) 72
Step-by-step explanation: I got it right