What is the first step in evaluating this expression? Expression
15 + 20 ÷ (10 - 7) + 12

A. Subtract 7 from 10.
B. Divided 20 by 10.
C. Add 15 and 20.
D. Add 7 and 12.

ILL GIVE BRAINLEST IS CORRECT
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△cde maps to △stu with the transformations (x, y) arrowright (x − 2, y − 2) arrowright (3x, 3y) arrowright (x, −y). if cd = a + 1, de = 2a − 1, st = 2b + 3 and tu = b + 6, find the values of a and b. the value of a is and the value of b is .

Aswimming pool is a rectangle with semicircles on the end. the rectangle is 12 meters wide and 30 meters long. the diameter and width of the swimming pool are equal. sketch and label an overhead diagram of the swimming pool. find the area of the swimming pool floor.

Solve: 3x+y=6 4x-2y=18 show all work !