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NISA [10]
3 years ago
8

If f(x) = 7x2 - 4x, what is the value of f(2)? F -8 J 17 G 2 K 20 H 6

Mathematics
1 answer:
kow [346]3 years ago
4 0

Answer:

K 20

Step-by-step explanation:

f(x) = 7x2 - 4x

f (2) = 7 (2)^2 - 4(2)

= 28 - 8

= 20

Since they replaced the x inside f(x) with 2, just do that the same to the right side, change all x into 2

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A line extends from a side of a triangle. Which new angle is created by extending one side of a triangle? a remote interior angl
postnew [5]

Answer:

c) an exterior angle

Step-by-step explanation:

i dont know why the other person said it was right on edge, cause i got it wrong by saying a/a remote interior angle. but now i know that the correct answer is C so dont make the same mistake as me!

7 0
3 years ago
Read 2 more answers
Prove that for any natural n the value of the expression (n+7)^2–n^2 is divisible by 7.
Afina-wow [57]

Step-by-step explanation:

(n + 7)² – n²

n² + 14n + 49 – n²

14n + 49

7 (2n + 7)

7 is a factor, so for any natural n, (n + 7)² – n² is a multiple of 7.

3 0
3 years ago
In an experiment, a ball is drawn from an urn containing 11 red balls and 13 purple balls. If the ball is red, two coins are tos
joja [24]
Sample space is the total number of possible outcomes. The general formula for this is r^n, where r is the number of outcomes per trial, while n is the number of trials. 

For the first question, the equation would be 2² because 2 coins are tossed so n=2. Then, r=2 because there are two possible outcomes, namely, the head and the tail. So, the answer for letter a is 4.

For the second question, we will add to the answer in letter a with 2³, because this time, 3 coins are tossed. Thus, the total sample space is 4 + 2³ = 12.
6 0
3 years ago
Tyler is thinking of a number that is divisible by 2 and by 3. Write another number in which Tyler's number must also be divisib
Mumz [18]

Answer:

6

Step-by-step explanation:

6 because 6/2=3,6/3=2

3 0
3 years ago
Let A be a 5 × 4 matrix with a pivot in each column. Is A invertible? Why or why not?
erastova [34]

Answer:

Matrix A is not invertible.

Step-by-step explanation:

Invertible matrix are those matrix which are square matrix or non singular matrix.

For any matrix to be invertible, matrix should be non singular i.e. det(x)\neq 0.

But for the question given above we cannot find determinant of matrix A as it is not square matrix. so inverse of given matrix does not exist. so it is not possible to have non trival solutions.

6 0
3 years ago
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