Answer:
pine:oak=3:1
pine=3/4*120
pine=90 trees
Step-by-step explanation:
Answer:
a = 18
Step-by-step explanation:
a/6 = 3
Multiply each side by 6
a/6*6=3 *6
a = 18
Answer:
-16
Step-by-step explanation:
1 - 8 - 9 = - 16
3) x² - 121 = 0
x² = 121
x' = +√121
x' = 11
_______________
x'' = - √121
x'' = -11
Solution ⇒ S{-11 ; 11 } or (x-11)(x+11)
4) 4x² + 144 = 0
4x² = -144
x² = -144 / 4
x² = -36
x = √-36
No solution ⇒ S = ∅
5) z²+10z+21 = 0
Δ = 10² - 4(1)(21)
Δ = 100 - 84
Δ = 16
x' = (-10+4) / 2 = -6/2 = -3
x'' = (-10-4) / 2 = -14/2 = -7
Solution ⇒ S{ -7 ; -3} or (x+3)(x+7)
2.755778 lbs or round to 2.76 or 3 depending on the question
