Question

Please help me solve all of this thank you :) have a nice day <3

Answer 1

I don't know how you wanted to round it

1)

SA = 8(7) + 12(7) + 10(7) +
`(1)/(2)`
`√(-8^4+2(8x12)^2+2(8x10)2-12^4+2(12x10)^2-10^4)`

SA = 289.3725

V =
`(1)/(4)` (7)
`√(-8^4+2(8x12)^2+2(8x10)2-12^4+2(12x10)^2-10^4)`

V = 277.80389

2)

SA = 8.1(13) + 8(13) + 8.1(13) +
`(1)/(2)`
`√(-8.1^4+2(8.1x8)^2+2(8.1x8.1)^2-8^4+2(8x8.1)^2-8.1^4)`

SA = 370.94749

V =
`(1)/(4)` (13)
`√(-8.1^4+2(8.1x8)^2+2(8.1x8.1)^2-8^4+2(8x8.1)^2-8.1^4)`

V = 366.2587