Question

Please help me steps by steps

Answer 1

The last formulas are called

square based pyramid formula

cone formula

sphere formula

Can help with the first two as im short of time

Hope this helps.

Always remember to check the units^3

Explanation:

19) V = π r 2 h = 1781.28303 ft3 = 1781.3ft^3

20) V = 1/2 b h l = 180m^3

Answer 2

question 19 = no solution because not enough information

question 20 = 18 for volume

Explanation:

question 19:

cylinder formula

surface A =2πrh+2πr2

2π times 9 times 7 + 2π times 9 times 2

SA = 508.938009882

volume equals 395.840674352

question 20:

biggest one,

4h﹣a4+2(ab)2+2(ac)2﹣b4+2(bc)2﹣c4

V=18 IS the volume