What are the means of the following proportion 3/15=12/60

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

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

Need 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.