SAT Math : How to find a solution set

Study concepts, example questions & explanations for SAT Math

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Example Questions

Example Question #172 : Equations / Inequalities

Solve and describe your answer in both inequality notation and interval notation:

10< -3a+10\leq 34

Possible Answers:

-8 \leq a< 0

\left [ -8,0\left \right )

\left ( 0, -8]

\left ( 8,0 \right )

-a \leq -8

-8\leq a> 0

Correct answer:

-8 \leq a< 0

\left [ -8,0\left \right )

Explanation:

This is a question with double inequality.

First solve the left side which will be 10< -3a+10 which will give you a<0  and then solve the right side which is -3a+10\leq 34 and solution is -a\leq 8 which is really equal to a\geq -8

Example Question #12 : How To Find A Solution Set

\left | 2x-3 \right |\leq 5

Possible Answers:

x\leq 4

x\leq 4 , x\geq -1 OR \left [ -1,4 \right ]

\left [ 4,-\alpha \)\cup \left [ -1, +\alpha \ )

x\geq -1

Correct answer:

x\leq 4 , x\geq -1 OR \left [ -1,4 \right ]

Explanation:

This question deals with absolute value inequalities and as a result you get a set of solutions.

The first solution involves solving 2x - 3\leq 5 which gives you x\leq 4.

Next solve for 2x-3\geq -5 which will give you x\geq -1.

Since x\leq 4 and x\geq -1 overlap, the correct solution is [-1,4]

Example Question #11 : How To Find A Solution Set

.63475634... : What is the 22nd digit after the decimal?

Possible Answers:

5

6

4

7

3

Correct answer:

3

Explanation:

The repeating pattern after the decimal is 63475, so the 22nd number would be 3.

Example Question #12 : How To Find A Solution Set

\left | x+3 \right |\leq -4

Possible Answers:

x\leq -7, x\geq +1

None\ of\ the\ answers.

No\ solution

x\geq 1

x\leq -7

Correct answer:

No\ solution

Explanation:

This problem deals with absolute value inequalities.

An absolute value expression can never be less than 0.  So the correct answer is "No Solution"

Example Question #13 : How To Find A Solution Set

Let  be an integer that can be represented by . If , , and  are integers such that , and , what is a possible value for ?

Possible Answers:

Correct answer:

Explanation:

In order to find n, we need to figure out possible values for a, b, and c.

We are told that a, b, and c are integers. We are also told that 0 < a < b < c, which means that a, b, and c are all positive. It also means that a, b, and c are different numbers (they cannot be equal). It also means that a is the smallest, and c is the largest.

We are now told that a + b + c = 7.

Let's start with the smallest possible value that a could be. The smallest integer greater than 0 is 1.

Let us assume that a = 1.

If a = 1, then b > 1. The smallest integer that b can be is 2. So let's assume b = 2.

If a =1 and b = 2, then 1 + 2 + c = 7. This means that c = 4.

If a =1, b = 2, and c = 4, then all of the conditions for a, b, and c are met. Thus, we can use these values to find n.

What if we had assumed that a was 2? If a is 2, then the smallest value that b could be is 3. If a + b + c = 7, then c would have to be 2. But we are told that c is the largest number, so it can't be equal to 2.

Thus, the only value of a that works is 1.

Let's assume that if a = 1, then b = 3. If a + b + c  = 7, then c = 3. However, we are told that c > b. Thus, b cannot be 3.

Thus, b must equal 2, and c must equal 4, and a must be 1. This is the only possibility that satisfies all of the criteria given in the question.

Now we can use the values of a, b, and c to find n.

n =2a3b5c

n = 213254 = 2(9)(625) = 11250.

The answer is 11250.

 

 

 

Example Question #14 : How To Find A Solution Set

Find the product of the values of  that satisfy the following equation:

 

Possible Answers:

Correct answer:

Explanation:

Because we are dealing with an absolute value on the left side, we are going to have to consider two possible cases. Remember that, in general, |a| = a if a > 0, and |a|  = –a if a < 0. In other words, we need to consider two cases for the left side: x– 2x – 8 and –(x– 2x – 8).

Case 1: |x2 – 2x – 8| = x2 – 2x – 8 = 2x + 4

x2 – 2x – 8 = 2x + 4

Subtract 2x from both sides.

x2 – 4x – 8 = 4

Subtract 4 from both sides.

x2 – 4x – 12 = 0

We must think of two numbers that multiply to give us –12 and add to give –4. These two numbers are –6 and 2. This means we can factor the left side as follows:

x– 4x – 12 = (x – 6)(+ 2) = 0

Set each of the factors equal to 0.

x – 6 = 0

Add 6 to both sides.

x = 6

Next, x + 2 = 0

Subtract 2 from both sides.

x = –2

The values of x that solve the equation are –2 and 6.

However, before moving on to the next case, it's always important to check our work. Let's put x = –2 and x = 6 into our original equation and make sure that both sides are the same.

|x– 2x – 8| = 2x + 4

Let x = –2:

|x2 – 2x – 8| = |(–2)– 2(–2) – 8| = |4 + 4 – 8| = 0

2x + 4 = 2(–2) + 4 = 0

x = –2 is a solution.

Let x = 6:

|6– 2(6) – 8| = |36 – 12 – 8| = 16

2+ 4 = 2(6) + 4 = 16

x = 6 is also a solution.

Case 2:  |x2 – 2x – 8| = –(x2 – 2x – 8) = 2x + 4.

 –(x2 – 2x – 8) = 2x + 4

Distribute the –1.

–x+ 2x + 8 = 2x + 4

Subtract 2x from both sides.

–x2 + 8 = 4

Subtract 8 from both sides.

–x2 = –4

Divide both sides by negative 1.

x2 = 4

Take the square root.

x = 2 or –2

We have already established that x = –2 is a solution. Let's check to see if 2 is also a solution by going back to the original equation |x2 – 2x – 8| = 2x + 4.

|x2 – 2x – 8| = |22 – 2(2) – 8| = |–8| = 8

2x + 4 = 2(2) + 4 = 8

This means x = 2 is also a solution.

To summarize, the solutions to x are –2, 2, and 6.

We are asked to find their product, which is –2(2)(6) = –24.

The answer is therefore –24.

Example Question #183 : Equations / Inequalities

The set  contains all multiples of . Which of the following sets are contained within

I. The set of all multiples of

II. The set of all multiples of

III. The set of all multiples of

Possible Answers:

I only 

II only 

I and II 

III only 

I, II, and III

Correct answer:

III only 

Explanation:

Think of the multiples of 10: 10, 20, 30, 40, 50, 60, 70, . . . 

I. Multiples of 2: 2, 4, 6, 8, 10, 12, 14, . . . 

Some of these already are not contained in S. 

II. Multiples of 5: 5, 10, 15, 20, 25, . . . 

Some of these already are not contained in S. 

III. Multiples of 20: 20, 40, 60, 80, 100, . . . 

All of these are also multiples of 10. Thus, our answer must be III only. 

Example Question #1958 : Sat Mathematics

Different colored marbles are placed in a bag. There are  red marbles,  black marbles, and  green marbles in the bag. What is the probability that a green marble will be chosen? 

Possible Answers:

Correct answer:

Explanation:

When doing probability problems, we are looking for the number of successes over number of possible outcomes. There are 4 chances to successfully choose a green marble. The number of possible outcomes are 11, one for each of the 11 marbles in the bag. When we write the fraction, we get our answer. 

In mathematical words we get the following:

Example Question #12 : How To Find A Solution Set

In the two equations below,  and .  What is the value of ?

Possible Answers:

Correct answer:

Explanation:

Example Question #2 : New Sat Math Calculator

Which of the following is a true statement?

Possible Answers:

Correct answer:

Explanation:

Looking at the second statement, isolate x on one side with all other constants and variables on the other side.

Looking at the third statement, isolate z on one side with all other constants and variables on the other side. 

Looking at the first statement, isolate y on one side with all other constants and variables on the other side. 

From here, use these equivalencies so solve for y.

Substituting twice:

 

 

 

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