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ACT Math : ACT Math

Study concepts, example questions & explanations for ACT Math

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Example Questions

Example Question #224 : Gre Quantitative Reasoning

We have x^2-4<0 , find the solution set for this inequality.

Possible Answers:

x>2, x<-2

x>-2

x<2

-2<x<2

x=0

Correct answer:

-2<x<2

Explanation:

$x^2-4<0 \Rightarrow x^2<4 \Rightarrow -2<x<2$

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Example Question #225 : Gre Quantitative Reasoning

Fill in the circle with either $<$ , $>$ , or $=$ symbols:

$(x-3)\circ\frac{x^2-9}{x+3}$ for $x\geq 3$ .

Possible Answers:

$(x-3)> \frac{x^2-9}{x+3}$

None of the other answers are correct.

The rational expression is undefined.

$(x-3)< \frac{x^2-9}{x+3}$

$(x-3)=\frac{x^2-9}{x+3}$

Correct answer:

$(x-3)=\frac{x^2-9}{x+3}$

Explanation:

$(x-3)\circ\frac{x^2-9}{x+3}$

Let us simplify the second expression. We know that:

$(x^2-9)=(x+3)(x-3)$

So we can cancel out as follows:

$\frac{x^2-9}{x+3}=\frac{(x+3)(x-3)}{(x+3)}=x-3$

$(x-3)=\frac{x^2-9}{x+3}$

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Example Question #1 : How To Find The Solution To An Inequality With Multiplication

Solve the following inequality:

$-\frac{1}{3}x>3$

Possible Answers:

x>-1

x>-9

x<-1

x<-9

Correct answer:

x<-9

Explanation:

To solve simply solve as though it is an equation.

The goal is to isolate the variable on one side with all other constants on the other side. Perform the opposite operation to manipulate the inequality.

However, remember that when dividing or multiplying by a negative number, you must flip the inequality sign.

$-\frac{1}{3}x>3$

Multiply by -3, thus:

x<-9

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Example Question #2 : How To Find The Solution To An Inequality With Multiplication

Solve the following inequality:

-4x>16

Possible Answers:

x<4

x>4

x<-4

x>-4

Correct answer:

x<-4

Explanation:

To solve, simply treat it as an equation.

This means you want to isolate the variable on one side and move all other constants to the other side through opposite operation manipulation.

Remember, you only flip the inequality sign if you multiply or divide by a negative number.

Thus,

$-4x>16\Rightarrow \frac{-4x}{-4}>\frac{16}{-4}\Rightarrow x<-4$

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Example Question #1 : How To Find The Solution To An Inequality With Division

Which of the following inequalities defines the solution set for the inequality 14 – 3x ≤ 5?

Possible Answers:

x ≥ 3

x ≤ –19/3

x ≤ 3

x ≥ –3

x ≤ –3

Correct answer:

x ≥ 3

Explanation:

To solve this inequality, you should first subtract 14 from both sides.

This leaves you with –3x ≤ –9.

In the next step, you divide both sides by –3, remembering to flip the inequality sign when you do this.

This leaves you with the solution x ≥ 3.

If you selected x ≤ 3, you probably forgot to flip the sign. If you selected one of the other solutions, you may have subtracted incorrectly.

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Example Question #1 : How To Find The Solution To An Inequality With Division

Solve 6x – 13 > 41

Possible Answers:

x > 4.5

x < 6

x > 9

x > 6

x < 9

Correct answer:

x > 9

Explanation:

Add 13 to both sides, giving you 6x > 54, divide both sides by 6, leaving x > 9.

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Example Question #1 : How To Find The Solution To An Inequality With Division

Solve for .

$\small 14-2x\geq 22$

Possible Answers:

$\small x\geq-4$

$\small x\geq4$

$\small x\leq-4$

$\small x\leq4$

Correct answer:

$\small x\leq-4$

Explanation:

$\small 14-2x\geq22$

$\small -2x\geq8$

When dividing both sides of an inequality by a negative number, you must change the direction of the inequality sign.

$\small x\leq-4$

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Example Question #3 : How To Find The Solution To An Inequality With Division

Solve 3 < 5x + 7

Possible Answers:

$-\frac{4}{5}<x$

2 > x

$-\frac{3}{5}<x$

2<x

$-\frac{4}{5}>x$

Correct answer:

$-\frac{4}{5}<x$

Explanation:

Subtract seven from both sides, then divide both sides by 5, giving you –4/5 < x.

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Example Question #1941 : Act Math

Find is the solution set for x where:

$\left | 5x-3\right |>12$

Possible Answers:

$-\frac{9}{5}< x< 3$

$-3< x< \frac{9}{5}$

x> 3 or $x< -\frac{9}{5}$

x> -3 or $x< \frac{9}{5}$

$x< -\frac{9}{5}$

Correct answer:

x> 3 or $x< -\frac{9}{5}$

Explanation:

We start by splitting this into two inequalities, (5x-3)>12 and (5x-3)<-12

We solve each one, giving us x>3 or $x<\frac{-9}{5}\right$ .

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Example Question #1 : How To Find The Solution To An Inequality With Division

Which of the following could be a value of , given the following inequality?

$8-7x\leq11x+4$

Possible Answers:

$-\frac{2}{3}$

$-\frac{1}{3}$

$\frac{4}{9}$

$\frac{1}{9}$

$-\frac{2}{9}$

Correct answer:

$\frac{4}{9}$

Explanation:

The inequality that is presented in the problem is:

$8-7x\leq11x+4$

Start by moving your variables to one side of the inequality and all other numbers to the other side:

$-7x-11x\leq4-8$

$-18x\leq-4$

Divide both sides of the equation by . Remember to flip the direction of the inequality's sign since you are dividing by a negative number!

$x\geq\frac{-4}{-18}$

Reduce:

$x\geq\frac{2}{9}$

The only answer choice with a value greater than $\frac{2}{9}$ is $\frac{4}{9}$ .

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ACT Math : ACT Math

Study concepts, example questions & explanations for ACT Math

All ACT Math Resources

Example Questions

Example Question #224 : Gre Quantitative Reasoning

Example Question #225 : Gre Quantitative Reasoning

Example Question #1 : How To Find The Solution To An Inequality With Multiplication

Example Question #2 : How To Find The Solution To An Inequality With Multiplication

Example Question #1 : How To Find The Solution To An Inequality With Division

Example Question #1 : How To Find The Solution To An Inequality With Division

Example Question #1 : How To Find The Solution To An Inequality With Division

Example Question #3 : How To Find The Solution To An Inequality With Division

Example Question #1941 : Act Math

Example Question #1 : How To Find The Solution To An Inequality With Division

All ACT Math Resources

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