Answer:
We have been given an equation
We will factorize it by middle term splitting.
Step 1:
Taking common factors out by clubing first two terms ad last two terms
Step 2:
Step 3:
Equating both above factors to zero as:
Step 4:
And .
To figure out how much she travels in one hour you just do 567÷9 so...
567÷9=63
Helen travels 63 miles per hour
An acute angle has a smaller measure than an obtuse angle