What does this mean and what is the answer?

-3(-7)​

-3 * -7 = 21

Step-by-step explanation:

-3(-7) = -3 * -7

Multiply

Remember: negative * negative = positive

So -3*-7 = 21

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-Chetan K

-10

Step-by-step explanation:

Look at it this way. You borrowed 3 dollars and then you borrowed another 7 dollars. Now you owe 10 dollars.

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.

b

step-by-step explanation: