Answer:
x =28
Step-by-step explanation:
We can use proportions to solve this problem, Put the side of the small triangle over the side of the large triangle.
x 42
------- = -----------
x+10 42 + 15
Simplify
x 42
------- = -----------
x+10 57
Using cross products
57*x = 42 (x+10)
Distrbute 42
57x = 42x+420
Subtract 42x from each side
57x -42x = 42x-42x+420
15x = 420
Divide by 15
15x/15 = 420/15
x =28
Answer:
Pencils: 7 boxes
Erasers: 5 boxes
Step-by-step explanation:
She should buy 70 pencils and 70 erasers.
There are 7 pencil boxes for 70 pencils.
There are 5 eraser boxes for 70 erasers.
These are the smallest number of boxes she can buy without getting a fraction of a box.
Answer:
<h2>D. 5 hours</h2>
Step-by-step explanation:
rt=d
rt+rt=900
80t+100t=900
180t=900
18t=90
2t=10
t=5
5 hours
80*5+100*5=900
The answer is the 3 one ok
Answer:
16?
Step-by-step explanation:
4 + 4 + 4 + 4 equals
4 x 4 equals
16