Answer:
b = 60
Step-by-step explanation:
Using Pythagoras' identity in the right triangle
The square on the hypotenuse is equal to the sum of the squares on the other 2 sides, that is
b² + 63² = 87²
b² + 3969 = 7569 ( subtract 3969 from both sides )
b² = 3600 ( take the square root of both sides )
b = 
= 60
Answer:
Step-by-step explanation:
we know that
Haley's car gets at least 
miles per gallon
so
by proportion
Find the minimum number of gallons she'll need for a trip that is 
miles
the answer is 4.2 and i check if the answer is correct
and it was correct
9. she spends 1 hour total and 1/2 hour on spanish. So she has another 1/2 on another subject ( as she spends equal time on each subject)
So number of subjects = 1 / 1/2 = 1 * 2 = 2
