Each pant cost $13.50 because 71-17=54 and 54/4=13.5. Julie has 17 apples.
<span>Rate of pump A: 1/8 of a pool per hour
Rate of pump B: 1/9 of a pool per hour
Combined rate: 1/8+1/9 = 17/72 +1/9 = 25/72
So if they work together, the two pumps have a combined rate of 25/72 of a pool per hour (i.e in one hour, the two pumps will empty 25/72 of the pool)
</span><span>But we want to empty ONE pool (not 25/72 of one). So we need to multiply 25/72 by some number x to get 1.
</span>
<span>Now solve for x
x=2.88
</span><span>It will take the two pumps 2.88 hours to empty the pool.
2 hours 52 minutes 50 seconds</span>
So, we first want to think about PEMDAS - parentheses (in this case, brackets first), exponents (that 2³), then multiplication division addition subtraction, from left to right.
First, we take a look at what's inside the bracket:
2³[(15-7)(4-2)] ← Solve the stuff inside the bracket first. Now, we look at parentheses, and solve the things inside the parentheses
2³[(8)(2)] ← Multiply them together since they are inside the bracket
2³[16] ← Now that the bracket is taken care of, we look at the exponent. 2³=8, so:
8*16 ← Now multiply...
The answer is <u>128</u>
Multiplying fractions, unlike adding them, does not require you to find a common denominator. Simply multiply the numerator and denominator and simplify if you have to. In this case, it's .
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A negative multiplied by a positive is still negative, so this becomes .