Question

Myra is evaluating the expression –31. 7 4. 5x, when x = 2. 1. -31. 7 4. 5(2. 1) –27. 2(2. 1) –57. 12 What was Myra’s error? Myra should have multiplied -31. 7 and 2. 1 first. Myra should have multiplied 4. 5 and 2. 1 first. Myra should have subtracted -27. 2 and 2. 1 first. Myra should have added -31. 7 and 2. 1 first.

Answer 1

This is just an algebraic problem, the correct option is:

"Myra should have multiplied 4.5 and 2.1 first."

How to evaluate an expression?

Here we want to evaluate the expression:

-31.7 + 4.5*x

in x = 2.1

This just means that we need to replace x by 2.1 in the given equation.

Now, what Myra does is:

-31.7 + 4.5*2.1 = -27.2*2.1

So she took the sum between -31.7 and 4.5 first, this is her mistake, you only would do that if the expression was:

(-31.7 + 4.5)*2.1

But in our expression:

-31.7 + 4.5*2.1

The first thing you need to solve is the product in the second term, so we get:

-31.7 + 4.5*2.1 = -31.7 + 9.45 = -22.25

If you want to learn more about algebra, you can read:

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