Shea works in a lab. It takes Shea 30 minutes to calibrate her lab instrument. If she calibrated it 5 times last month, how many hours did she spend calibrating it?

2 and a half hours

Step-by-step explanation:

since it takes 30 min to calibrate, and she did it 5 times, that is 5x30 which is 150 minutes, 150 minutes is 2 and a half hours

b. would be the answer : )

step-by-step explanation:

step 1: add -16x to both sides.

16x−4y+−16x=64+−16x  

−4y=−16x+64

step 2: divide both sides by -4.

−4y /-4 = -16x + 64/-4

answer:   y=4x−16

hope i'm right