Answer:
x + 3
Step-by-step explanation:
Given
(8x - 6) - (7x - 9)
Distribute the first parenthesis by 1 and the second by - 1
= 8x - 6 - 7x + 9 ← collect like terms
= x + 3
Substitute the x values back into the equation
(1, 22)
(2, 18)
(3, 14)
(6, 2)
Answer:
D
Step-by-step explanation:
x=(-4(plus minus)sqrt(4^2-4*2*(-1))/2*2
x=(-4(plus minus)sqrt(16+8))/4
x=(-4(plus minus)sqrt(24))/4
x=(-4(plus minus)sqrt(2*2*6))/4
x=(-4(plus minus)2*sqrt(6))/4
x=(2(-2(plus minus)*sqrt(6)))/2*2
x=(-2(plus minus)*sqrt(6))/2
x=(-2+sqrt(6))/2
x=(-2-sqrt(6))/2
(Option 4 I think, but can see for sure)
Substitute the length of marathon into y.
26.5= 3x + 5.5
Solve for x (because that’s the amount of weeks needed to be ready and prepared)
3x = 26.5 - 5.5
3x = 21
x = 7
7 weeks of training is needed
