To multiply fractions do you need a common denominator

Write an equation in point-slope form for the line through the given point that has the given slope (-2,-7); m=-3/2

Find two numbers if their sum is 91 and the ratio is 6: 7?

The point of intersection of the diagonals of a rectangle is 4 cm further away from the smaller side then from the larger side of the rectangle. the perimeter of the rectangle is equal to 56 cm. find the lengths of the sides of the rectangle. 16 points answer quick