Answer:
x = - 7, x = 3
Step-by-step explanation:
To find the x- intercepts let f(x) = 0 , that is
x² + 4x - 21 = 0
Consider the factors of - 21 which sum to give the coefficient of the x- term (+ 4)
The factors are + 7 and - 3, since
7 × - 3 = - 21 and 7 - 3 = + 4, then
x² + 4x - 21 = 0
(x + 7)(x - 3) = 0 ← in factored form
Equate each factor to zero and solve for x
x + 7 = 0 ⇒ x = - 7
x - 3 = 0 ⇒ x = 3
Answer:
$5.10
Step-by-step explanation:
We need to find 20% of 25.50
Multiply 20% * 25.50
Change to a decimal
.20 *25.50
5.10
2x+y=1
-2x-y=3
0¥4
y=-2x+1
y=-2x-3
-2x+1=-2x-3
0¥4
The answer to the question is no solution
A supervisor finds the mean number of miles that the employees in a department live from work is 24. Then the correct option is B.
<h3>What is a z-score?</h3>
The z-score is a numerical measurement used in statistics of the value's relationship to the mean of a group of values, measured in terms of standards from the mean.
The z-score is given as

x = 29
s = 3.6
z = 1.5
Then the mean will be

More about the z-score link is given below.
brainly.com/question/15016913
Ratio equivalent to 2:9 is 4:18, 6:27
If you multiply the same number to both numbers, the ratio would always be the same.