I'm having trouble with these two questions. I do not know what I am doing wrong. Can you explain what I am doing wrong?

Evaluate the expression if x = 3, y = -7, and z = 9

xz - y2

3(9)+7^2
27+49
76

Determine how much interest you would earn on the following investment:

$862,000 invested at a 2.3% interest rate for 9 months.
I= 862000(0.023)9
178434

Thank you very much!

Question

I'm having trouble with these two questions. I do not know what I am doing wrong. Can you explain what I am doing wrong?  

Evaluate the expression if x = 3, y = -7, and z = 9

xz - y2

3(9)+7^2
27+49
76

Determine how much interest you would earn on the following investment:

$862,000 invested at a 2.3% interest rate for 9 months.
I= 862000(0.023)9
178434

Thank you very much!

ccostello23 · Answer

@Loser66 @IrishBoy123

loser66 · Answer

the first part is ok, the second part is wrong at *9 , 9 months = 3/4 year. You need put 3/4 instead of 9 at the end