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48-30+2
-16
b.1/3 12(-30)
1/3 (-360)
-120
y = √900 = 30
z = 25
a. 4x - y + 2
⇔ 4.12 - 30 + 2
⇔ 48 - 30 + 2
⇔ 20
b. 1/3 x (-y)
⇔ 1/3 (12) (-30)
⇔ 4 (-30)
⇔ - 120