Answer:
Step-by-step explanation:
Plug the first equation into the second

y=-2(-15)-5
=30-5
=25
Answer:
x=1.5,-1.5
Step-by-step explanation:
16x^4=81
x^4=5.0625
x=
=> x = 1.5,-1.5
Just multiply all of them because Volume = Length x Width x Height. So it's 8.5 x 4.5 x 3.75. That equals 143.4375. Cubic inches is just there after you multiply, so you don't have to convert anything. So it's 143.4375 cubic inches.
Please learn the equation
Circumference = π*d
Therefore C = π*3
so C = 9.42ft