Answer:
D
Step-by-step explanation:
5 x 3 = 15
5(+3)
5x+15
Answer:
x = 10
Step-by-step explanation:
y = 2x + 1
21 = 2x + 1
21 - 1 = 2x
2x = 20
x = 10
Answer:
<h2>
r(x+2) = 2x² + 3x - 1</h2>
Step-by-step explanation:

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