How to subtract 200 - 300 and divide 200 - 300

This will be a number between 200 and 300 that is of the form 20x+7

This is because the number has to be divisible by 20 and by 10 when you subtract 7 from it.

Our choices are:  207, 227, 247, 267, 287

The ones divisible by 3 are 207 and 267

Adding 3 to each gives 210 and 270... 270 is divisible by 9

The number is 267

Note that 267 is divisible by 3

              267-7=260 which is divisible by 10 and 20

              267+3=270 which is 9(30)

Step-by-step explanation:

false.

step-by-step explanation:

false.

cavalieri's principle makes that statement about the volumes, not about the areas.

it would open into a square depending on the type of envelope i’m not sure about the second part