Answer:
x = -8
Step-by-step explanation:
Step 1: Write equation
5x - 7(x + 1) = 9
Step 2: Solve for <em>x</em>
- Distribute -7: 5x - 7x - 7 = 9
- Combine like terms: -2x - 7 = 9
- Add 7 to both sides: -2x = 16
- Divide both sides by -2: x = -8
Step 3: Check
<em>Plug in x to verify it's a solution.</em>
5(-8) - 7(-8 + 1) = 9
-40 - 7(-7) = 9
-40 + 49 = 9
9 = 9
Answer:
30
Step-by-step explanation:
80 + 40 = 120
120 represents the total students for all 4 classes. And since there is an even amount in each class...
120 / 4 = 30
So 30 would be your answer.
Answer:
t = 8.69 s
Step-by-step explanation:
The height h of the rocket in feet above the surface of the lake can be modeled by :
Let we need to find the time to reach the ground. When it reach the ground, h = 0
We need to find the value of t.
t = 8.69 s and -2.45 s
Neglecting negative value,
t = 8.69 s
Hence, it will take 8.69 s to reach the ground.
Answer:
(x-5) (x-2)
Step-by-step explanation:
x^2 (-2x-5x) +10
basically you will write the equation down and then to double check multiply the x and then the -5 into (x-2). this can be repetitive if you get it wrong so try to do numbers that make sense.
