Jeff can build 7 birdhouses in 5 hours. Use a proportion to find out how long it would take
him to build 30 birdhouses. (Round answer to
nearest whole number)

21 hours

Step-by-step explanation:

We can use a ratio to solve

7 houses       30 houses

 =

5 hours         x hours

Using cross products

7x = 5*30

7x = 150

Divide by 7

7x/7 =150/7

x =21.42857143

Rounding to the nearest whole number

x = 21 hours

answer: i'm not going to give you the answer, but some hints to work it out.

step-by-step explanation: so, if there is a straight line that means that the line angle is 180°. so we subtract the 2 angle measures provided, (15 and 38) from 180. so the answer is 180 - (38 + 15). (you have to solve the equation)