Answer:
Step-by-step explanation:
Discussion.
Not directly. But the quadratic formula can do it. But that's not your question.
the factors you get must contain the factors for 1 which are 1 and - 1
These factors must add to - 5. There's no way that will happen with 1 and - 1 and you would be creative math if you tried to say that you could make one of the factors (x -1-1-1-1-1-1). That creates a whole new question.
Answer:
x = 45
Step-by-step explanation:
Corresponding sides of similar triangles will be in same ratio.
![\dfrac{x}{x+18}=\dfrac{20}{28}](https://tex.z-dn.net/?f=%5Cdfrac%7Bx%7D%7Bx%2B18%7D%3D%5Cdfrac%7B20%7D%7B28%7D)
Cross multiply
x*28 = 20*(x+18) {Use distributive method}
28x = 20x + 360
28x - 20x = 360
8x = 360
x = 360/8
x = 45
Answer:
840
Step-by-step explanation:
120 is 40% of 300, and 840 is 40% of 2100 is 840.
Answer:
f(- 2) = - 2
Step-by-step explanation:
To evaluate f(- 2) substitute x = - 2 into f(x)
f(- 2) = 3(- 2) + 4 = - 6 + 4 = - 2
To find the mean, you have to add all the numbers then divide it by how many numbers there are.
In this case, you'll need to add all those numbers and divide it by 4.
![2046+971+3113+1850=7980\\7980\div4=1995](https://tex.z-dn.net/?f=2046%2B971%2B3113%2B1850%3D7980%5C%5C7980%5Cdiv4%3D1995)
The mean is 1995.