Answer: -3(a+4) or -3a-12
Step-by-step explanation:
When you simplify, you want to use your order of operations.
-6a-12+3a
-3a-12
-3(a+4)
Answer:
b^2
Step-by-step explanation:
200 sections will cost $7439.
We first see if the rate of change, the slope, is the same between data points. If it is, the function will be linear. We use the formula
m = (y₂ - y₁)/(x₂ - x₁)
For the first two data points, we have
m = (1889-409)/(50-10) = 1480/40 = 37
For the second two data points, we have
m = (4664-1889)/(125-50) = 2775/75 = 37
Now that we know the slope is the same, we can write the equation:
y - y₁ = m(x - x₁)
y - 409 = 37(x - 10)
y - 409 = 37x - 370
Add 409 to both sides:
y = 37x + 39
Using 200 as x,
y = 37(200) + 39 = 7439
The original class had 32 students. 25% of 32 is 8 and 32+8=40
2x-24 = 68 2x = 92 so x = 46. Sarah is 22 and her mum is 46.
