Answer:
8x-24
Step-by-step explanation:
We open parenthesis, so we get:
6x-21+2x-3
Then, simplify by adding like terms:
8x-24 is your answer :)
Stay golden :)
You solve the equation : t^2 - 9t - 90 = 0 ;
Δ = ( - 9 )^2 - 4 * 1 * ( - 90 ) = 81 + 360 = 441 ;
t1 = ( 9 +
) / 2 = 30 / 2 = 15 ;
t2 = ( 9 -
) / 2 = -12 / 2 = - 6 ;
The numbers are 15 and - 6 ;
Answer:
D. 10 units
Step-by-step explanation:
Use pythagorean theorem
Answer:
y = 0.75x + 12
Step-by-step explanation:
The estimated total cost, y, of a child's toy is partially based on the number 1 point of batteries used, x. The cost of one battery is $0.75. The toy itself costs $12. Which equation represents the situation?
y = 12x + 0.75
y = 0.75x + 12
y = 12x − (775
y = 0.75x − 12
y = total cost of a child's toy
Cost of each battery = $0.75
Number of batteries = x
Cost of the toy = $12
Therefore,
total cost of a child's toy = Cost of the toy + Cost of each battery * Number of batteries
y = 12 + 0.75 * x
y = 12 + 0.75x
y = 0.75x + 12
Answer:
15
Step-by-step explanation:
f (x) = -2x + 5 ➡ replace x with -5
f (-5) = -2 •(-5) + 5 = 15
