I need help one this question 10 divided 75.10

Enter the missing numbers in the boxes to complete the table of equivalent ratios of lengths to widths. ? 18 8 ? 10 30 12 ?

One side of a rectangle is 7 feet shorter than seven times the other side. find the length of the shorter side if we also know that the perimeter of the rectangle is 306 feet.

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base