Iknow i didn't do this right.. can someone me?

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

The perimeter of a triangle is 69 cm. the first is 5 cm shorter than the second side. the third side is twice as long the first side. find the length of each side

Jane’s favorite fruit punch consists of pear, pineapple, and plum juices in the ratio 5: 2: 3. how many cups of pear juice should she use to make 20 cups of punch?