Question

what is this called and how do I solve it

Answer 1

You will use the idea of similar triangles to set up a ratio...

3/4=7/(4+PS)  multiply both sides by 4

3=28/(4+PS) multiply both sides by 4+PS

12+3PS=28 subtract 12 from both sides

3PS=16 divide both sides by 3

PS=16/3

PS=5 1/3