This morning, perla took a history test. there were 72 multiple-choice problems on the test and perla answered 75% of them correctly. how many problems did perla get right?

First we must convert 75% into a decimal so

Now we just multiply the total times the percentage correct:

72 x 0.75 = 54 questions correct. Additionally that also means that Perla got 18 questions incorrect, since 72-54=18.

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1.17+3.99a. you combine the terms with a to create 3.99 and the 1.17 stays because it has no like terms or a variable