Answer:
38
Explanation:
RST = RSQ + QST
70 = 3x-10 + 2x
Combine like terms
70 = 5x-10
Add 10 to each side
70 + 10 = 5x-10+10
80 = 5x
Divide each side by 5
80/5 = 5x/5
16 =x
Now find QSR
QSR = 3x-10
3*16 - 10
48-10
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