exam Maths Puzzle Numerical Ability

My problem is; Kristi jogged for 3/5 of an hour, swam for 1/2 of an hour, and rode her bicycle for 3/4 of an hour. How long did she exercise?

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exam Other Question

Write log b 81 = 2 in exponential form.

find the slope of the line that goes through tht following points...thanks

(-4, 6), (-8, 6)