Find the perimeter of a rectangle with a length of 12 feet and a width of 8 feet

Which statement about perfect cubes is true

Given abcd ac=38 and ae=3x+4 find the value of x

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.