Simplify: (6-91)-(2-31)
2 answers:
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Answer:
Part 1) The length is 7 cm
Part 2) The rate of return is r=11%
Step-by-step explanation:
Part 1)
Let
x ----> the length of rectangle
y ----> the width of rectangle
we know that
The perimeter of rectangle is equal to
so
simplify
-----> equation A
The width of a rectangle is one more than twice its length
so
----> equation B
substitute equation B in equation A
solve for x
therefore
The length is 7 cm
Part 2) we know that
The simple interest formula is equal to
where
I is the Final Interest Value
P is the Principal amount of money to be invested
r is the rate of interest
t is Number of Time Periods
in this problem we have
substitute in the formula above
solve for r
Convert to percentage (Multiply by 100)