6th grade math help please :))

C

Step-by-step explanation:

A) For this one, you must multiply the 7 by 2 and make sure not to forget to put "x" on the end of it. (You may wonder why we are able to do this even though the 7 doesn't have an x! Because of the commutative property that tells us: when we are multiplying or adding, we can switch things around without affecting the answer, we can switch all the numbers and variables around however we'd like, multiply, then get the same correct answer! The 2 and the x are being multiplied together in the first place.) This gives us 14x, which does not equal 9x.

B) 3 + 5 = 8, so the first part would be 8x...NOT 15x

C) In this one, we'll use the distributive property in order to "get rid of" the 4. First, take 4*2x. This will give you 8x. Next, multiply 4 by negative 6. Yes, NEGATIVE six! Later in algebra, you will use the subtraction sign as a "negative" sign. You should have -24. Now, put these two together, getting 8x - 24! Ya it matches

D) Just by looking at this one, we can see that it won't match. Any number that has an exponent must be multiplied by itself that many times! However, in this case, there are only addition signs so they are not equal.

answer: b

step-by-step explanation:

391.6 is the correct answer