Please explain I don’t get it

1) 15.5<a<16.5

2) 9.5<b<10.5

3)550<<650

4)5500<<6500

5)5950<<6050

6)5995<<6005

7)5999.5<<6000.5

Step-by-step explanation:

To do these you're essentially looking for the range that the answser could be if it were an estimation. for example:

for 1, the answer is 16, but if it were 15.5 or anything higher you would round up to 16, or if it were anything below 16.5 you would round down to 16.

Note that that is not if it were 16.5 because that would mean you would round up to 17.  A must be less than (<) 16.5, while in the other sense, 15.5 it can be that exact number so you have a

For ones like 3 its the same thing. But if you were always rounding to the hundreds place, it could be anything above or equal to 550, since you are rounding up to the closest hundred. And it can also be less that 650.

the answer to the question is a  

it has the same slope and the same y-intercept.

the answer is 200

step-by-step explanation:

the way the question is worded, it seems to imply the $264 interest is simple interest, not compound interest.

the simple interest for 2 years is $264; the simple interest for 1 year is $132.

$132 interest on a $600 investment means an interest rate of (132/600)*100 = 22%.

the value of $200 at 22% interest compounded annually for three years is

200%281.22%29%5e3

the amount of interest is that value, minus the original $200.