Answer:
r^42
Step-by-step explanation:
Just multiply the two exponents together:
(r^7)^6 = r^42
Multiplication would be first
Answer:
1/2 and 6/12 have a proportional relationship, which means they are the same.
Step-by-step explanation:
Let x=annual interest rate of 18000 investment.
Then
18000*x - 9000(x-0.006)=648
Solve for x
18000x-9000x+9000*0.006=648
9000x=648-54=594
x=594/9000=0.066
Answer:
the annual interest rate of the 18000 investment is 6.6%
the annual interest rate of the 9000 investment is 6.0%
I would go about solving this by elimination because the x variables are already the same so all you would have to do is change one equation to the opposite signs and add them, so it would look like:
7y + 5x = 19
+ -3y - 5x = -7
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4y=12
y=3
