Which property of similarity can be used to prove triangles PQR and STU are similar?

Evaluate the expression for the given value of the variable 7a - 4a for a =8

Carley bought a jacket that was discounted 10% off the original price. the expression below represents the discounted price in dollars, based on x, the original price of the jacket.

Which spreadsheet would be used to compute the first nine terms of the geometric sequence a^n=32•(1/2)n-1