Your english teacher has given you a list of 10 possible topics for essays. you need to pick four topics from the list to write about over the school year.

how many different groups of four essay topics can you choose

210

Step-by-step explanation:

Its Combination so

10C4

= 10! / 4! (10-4)!

(10-4) = 6!

= 10 x 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 divided by

4 x 3 x 2 x 1   6 x 5 x 4 x 3 x 2 x 1

cross all the common factors

= 10 x 9 x 8 x 7 /  4 x 3 x 2 x 1  multiply those

5040 / 24 = 210 different groups of four essay topics that can be chosen.

HAVE A GREAT DAY!!!

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

$649.60

step-by-step explanation: