Question Bank / Math / Linear Equations in One Variable

Linear equations in one variable SAT question

Math · Algebra · Easy · Answer it here, explanation included.

If 2 n over 5, equals 10, what is the value of 2 n, minus 1 ?

ExplanationShow

Choice B is correct. Multiplying both sides of the given equation by 5 yields 2 n equals 50. Substituting 50 for 2 n in the expression 2 n minus 1 yields 50 minus 1, equals 49.

Alternate approach: Dividing both sides of 2 n equals 50 by 2 yields n equals 25. Evaluating the expression 2 n minus 1 for n equals 25 yields 2 times 25, minus 1, equals 49.

Choice A is incorrect and may result from finding the value of n minus 1 instead of 2 n minus 1. Choice C is incorrect and may result from finding the value of 2 n instead of 2 n minus 1. Choice D is incorrect and may result from finding the value of 4 n minus 1 instead of 2 n minus 1.

Drill this skill on Aceit

Adaptive practice, a daily plan, and score tracking take a free account so we can save your work.

Practice this skill

More Linear equations in one variable questions