Answer:
-1
Step-by-step explanation:
let numerator be x and denominator be y
x = y-3...eqn 1
{(x +7)/ (y+5) } - x/y = 1/2... eqn 2
expandin eqn 2...
2y(x+7) - 2x(y+5) = y(y+5)
=》 2xy + 14y - 2xy -10x = y^2 + 5y
=》 14y - 10x = y^2 + 5y...eqn 3
subst x = y-3 in eqn 3
=》 y^2 + 5y - 14y + 10y -30 = 0
=》 y^2 + y - 30 = 0
solving the eqn
y = 5 thus x = 2
subst y = x+3 into eqn 2
2x +14 = x +8
x = -6
Answer:
C) 75
Step-by-step explanation:
I got this because what you have to do, they all have to add up to 180. so what you do is:
2x + 30 = 180
-30 -30
2x = 150
2x/2 = 150/2
x = 75
Answer: 81
Step-by-step explanation:
When squaring negative numbers, the result is the same as if the negative sign wasn't there. 9 squared is 81.