exam Maths Puzzle Numerical Ability

Marla begins waling at 3 mi/h toward the library. Her friend meets her at the halfway point and drives her the rest of the way. The distance to the library is 4 mi. How many hours did marla walk?

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exam Other Question

PLEASE HELP:
5. Evaluate. |-19| - |-5|
A) -24
B) -14
C) 14
D) 24
Hello,
How do i solve this equation:

3^x = 1/9

thank you!