Answer:
A =62x^2
Step-by-step explanation:
The formula for surface area of a rectangular prism is given by
A=2(wl+hl+hw)
Given a width of 2x and length of 3x and a height of 5x, substitute into the equation
A = 2(2x*3x+ 5x*3x+ 2x*5x)
A = 2(6x^2 + 15x^2 +10x^2)
Combine like terms
A = 2(31x^2)
The last statement
i dont know
30 feet
a = l * w
Its a square so l and w are the same
x * x = 900
30 * 30 = 900
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If you know about square roots
x = √900
x = 30