Question

Pls answer I need it quick

1. If ƒ(x) = 4x – 11, what is the value of ƒ(5)?

A. 20x – 55
B. 34
C. 9....
D. 4


2. If the length (L) of a rectangle is 3 less than 4 times the width (W) of the rectangle, which of the following equations represents the relationship between the length and the width of the rectangle?
A. L = 3 – 4W.....
B. L = 4W – 3
C. W = 3 – 4L
D. W = 4L – 3

4. Sam wants to paint his living room and he needs to buy some materials. Cans of paint cost $10 each and paint brushes each cost $2 each. If Sam plans to spend exactly $50 on painting materials, which of the following equations represents the number of cans of paint (c) and the number of paint brushes (b) that he can purchase?
A. $10c + $2b = $50
B. $10b + $2c = $50
C. $12(c + b) = $50
D. $2(5c × b) = $50....

5. Solve:
(4x + 6) = 5
2(3r + 4) – 3(r + 1) = 11
A. r = 0
B. r = 2
C. r = 3 ....
D. r = 6

6. Solve for x: 3(x – 2) = 9
A. –5
B. –4
C. 4
D. 5....

7. Which answer BEST describes the solution for x if –3 < x + 4 ≤ 7?
A. x > –7...
B. x > –7 and x < 3
C. x ≥ –7 and x ≤ 3
D. x > –7 and x ≤ 3

8. Solve the compound inequality: 2x – 4 < –8 or x + 2 > 5
A. x < –2
B. x > –2 or x < 3
C. x < –2 or x > 3....
D. x > 3

9. What is the solution to the inequality –2x + 8 < 3(2x – 4)?
A. x < 1
B. x > –1....
C. x< 5/2
D. x> 5/2

Answer 1

1 yes
2 no
4 no but where is 3 maybe x=-1/4
5 no
6 yes
7 c
8 yes
9 no.... >5/2
because
-2x + 8 < 6 x - 12
-8 x <-20
when change sign, reverse arrow
8 x > 20
x > 20/8 or 5/2
8

Answer 2

1. Correct.

2. Width = W.
Length = 4W - 3.
L = 4W - 3.

4. $10c + $2b = $50.

5. 4x + 6 = 5, 4x = 5 - 6, X = -1/4.
2(3r + 4) - 3(r + 1) = 11.
6r + 8 - 3r - 3 = 11,
r = ?

6. Correct.

9. -2x + 8 < 3(2x - 4).
-2x + 8 < 6x - 12,
-2x-6x < -20,
-8x < -20,
X > 20/8,
X > 5/2.
Note: When dividing or multiplying by a neg. number, the inequality sign is reversed.