ACT Math : Matrices

Study concepts, example questions & explanations for ACT Math

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Example Questions

Example Question #1 : Matrix Combinations

Simplify.

Possible Answers:

Correct answer:

Explanation:

When we are asked to simplify a matrix that is being multiplied by a constant we simply multiply each component of the matrix with the scalar factor that is on the outside of the matrix.

Therefore,

Example Question #3 : How To Find Combinations With A Matrix

At a sale, a necklace that was originally   is marked ten percent off. Cara has a coupon that will allow her to get ten percent off the discounted price. How much will Cara pay for the necklace if she uses the coupon?

Possible Answers:

 

 

 

 

 

Correct answer:

 

Explanation:

Taking ten percent off of  gives us ,

.

Taking ten percent off of this amount gives us

.

NOTE: This problem cannot be solved by taking twenty percent off of .

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