AnswersCA-Mathematics ISlope-Intercept Form of a Line

Slope-Intercept Form of a Line — Unit test Answers

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1
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Solve the inequality.2(4+2x)≥5x+5

x
x≤−2
x
x≥−2
x
x≤3
x
x≥3
2
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A metalsmith is mixing two molten metals, each containing different percentages of silver. The table shows the amount of each molten metal used.

Question illustration
A
(15)(0.75) and 0.7(15 – x) + 0.9x
B
(15)(0.75) and 0.7(15 – x)(0.9x)
C
15 + 0.75 and 0.7(15 – x) + 0.9x
D
15 + 0.75 and 0.7(15 – x)(0.9x)
3

What is the value of p in the linear equation ?

Question illustration
A
−4
B
−2
C
2
D
4
4

Which number line represents the solution set for the inequality 3x < –9?

A
A number line from negative 4 to 4 in increments of 1. A point is at negative 3 and a bold line starts at negative 3 and is pointing to the left.
Option A
B
A number line from negative 4 to 4 in increments of 1. A point is at negative 3 and a bold line starts at negative 3 and is pointing to the right.
Option B
C
A number line from negative 4 to 4 in increments of 1. An open circle is at negative 3 and a bold line starts at negative 3 and is pointing to the left.
Option C
D
A number line from negative 4 to 4 in increments of 1. An open circle is at negative 3 and a bold line starts at negative 3 and is pointing to the right.
Option D
5

The sum of the interior angles, s, in an n-sided polygon can be determined using the formula s=180(n−2), where n is the number of sides.Using this formula, how many sides does a polygon have if the sum of the interior angles is 1,260°? Round to the nearest whole number.

A
6 sides
B
7 sides
C
8 sides
D
9 sides
6

What value of x is in the solution set of the inequality –2(3x + 2) > –8x + 6?

A
–6
B
–5
C
5
D
6
7

Solve the equation.–x + 8 + 3x = x – 6

A
x = –18
B
x = –14
C
x = 2
D
x = 4
8

Hiroshi spends 30 minutes on history homework, 60 minutes on English homework, and x minutes on math homework. One fourth of his total homework time is spent on math. Which equation can be used to find the amount of time Hiroshi spends on his math homework?

A
(x + 30 + 60) = x
Option A
B
(x) = x(30 + 60)
Option B
C
x(30 + 60) = x
Option C
D
(x) = (30 + 60)
Option D
9

Bianca wrote the steps for her solution to the equation 2.3 + 8(1.3x – 4.75) = 629.9. She left out the description for the last step.What is the missing step of her solution?

Question illustration
A
Add 10.4 to both sides.
B
Add negative 10.4 to both sides.
C
Multiply both sides of the equation by 10.4.
D
Divide both sides of the equation by 10.4.
10

Alex has 84 quarters and nickels worth a total of $17.80.

A
0.25q + 0.05(q – 84) = 17.80
B
0.05q + 0.25(84 – q) = 17.80
C
0.25(q – 84) + 0.05q = 17.80
D
0.05(84 – q) + 0.25q = 17.80
11

The formula for the area of a triangle is , where b is the length of the base and h is the height.Find the height of a triangle that has an area of 30 square units and a base measuring 12 units.

Question illustration
A
3 units
B
5 units
C
8 units
D
9 units
12

On the freeway, it is unsafe to drive too slowly or too quickly. The safest driving speeds on the freeway near Allan’s town were scientifically determined to be between the minimum and maximum speeds (in miles per hour) according to the equation |x – 55| = 4.2. Which equation can be used to determine the maximum safe driving speed?

A
x – 55 = 4.2
B
x – 55 = –4.2
C
x + 55 = 4.2
D
x + 55 = –4.2
13

Sara wants to find the input value that produces the same output for the functions represented by the tables.

Question illustration
A
–2
B
–1
C
1
D
2
14

The axis of symmetry for a quadratic equation can be found using the formula , where a and b are coefficients in the quadratic equation and x represents the values along a vertical line on the coordinate plane.What is the equation when solved for a?

Question illustration
A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
15

Laurie is trying to stay within 10 feet of her current diving depth of –30 feet (with regard to sea level) so that the light is still good but she can be close to the sea life during her scuba dive. Which two equations can be used to find the minimum and maximum depths Laurie wants to stay between?

A
-30 - x = 10 and -30 - x = –10
B
-30 + x = 10 and -30 + x = –10
C
x + 10 = 30 and x + 10 = –30
D
x – 10 = 30 and x – 10 = –30

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