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3(3x+3)=8x+5 Solve the equation above for x. Which of the following is correct?

A. 1

B. 4

C. -1

D. -4

Answer Explanation:

We use the order of operation to solve for the unknown value of x.  

3(3x+3)=8x+5

Multiply 3 with each number in the brackets

(3*3x)+(3*3)=8x+5

9x+9=8x+5

Subtract 9 from both sides

9x+9-9=8x+5-9

9x=8x-4

Subtract 8x on both sides

9x-8x=8x-8x-4

x=-4

Thus, the unknown value of x is -4.

Therefore, the Correct Answer is D.

More Questions on TEAS 7 Math

  • Q #1: 3 (x-2) = 18 Solve the equation above for x. Which of the following is the correct answer?

    A. 8

    B. -5

    C. 7

    D. 4

    Answer Explanation

    We solve for the value of x by following the order of operations

    3(x-2)=15

    Divide both sides of the equation by 3

    Add 2 to both sides of the equation

    Thus, the value of x is 8.

  • Q #2: How may milliliters are there in 2.5 liters?

    A. 0.25

    B. 250

    C. 25

    D. 2500

    Answer Explanation

    We use 1 L =1000 mL to convert between the two units. The conversion options of interconversions are:

    And

    We want millimeters, use the second option to change L to mL as:

    Therefore, 2.5 L is equivalent to 2500 mL.

  • Q #3: An athlete runs 7 miles in 45 minutes and then changes their pace to run the next 3 miles in 15 minutes. Overall, what is the average time in minutes it takes the athlete to run 1 mile?

    A. 9.5 minutes

    B. 9 minutes

    C. 6 minutes

    D. 10minutes

    Answer Explanation

    to find the average time the athlete runs in 1 mile; we find total distance and total time the athlete takes in running.

    Total distance run by athlete=7+3=10 miles

    Total time=45+15 =60 minutes

    The athlete runs 10 miles in 60 minutes. For the athlete to cover 1 mile, he will run for a time less than 60 minutes. Thus, in 1 mile, the athlete takes:

    So, in 6 minutes, the athlete covers 1 mile.