ITS A ANGLE QUESTON PLS HELP

Noor brought 21 sheets of stickers. she gave 1/3 of a sheet to each of the 45 students at recess. she wants to give teachers 1 1/2 sheets each.

What is the measure of ac? 5 units 13 units 26 units 39 units 3x- 2b 6x + 9

Two corresponding sides of two similar triangles are 3cm and 5cm. the area of the first triangle is 12cm^2. what is the area of the second triangle?