Can someone with attached maths questions

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

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

On the first of each month sasha runs a 5k race she keeps track of her times to track her progress her time in minutes is recorded in the table