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murzikaleks [220]
4 years ago
9

An equivalent expression for 9(2a+1)

Mathematics
2 answers:
Alexeev081 [22]4 years ago
7 0
An equivalent expression is 18a+9
egoroff_w [7]4 years ago
7 0

Answer:

18a+9

Step-by-step explanation:

(If confused please tell me)

When a question like this comes up, you have to multiply the outside number (which is currently 9) and the two numbers inside the parentheses. First you multiply 9x2a, which is 18 but you must not forget the letter so in that case it will be 18a. Now you have to do 9x1 which is 9, there is no letter so in that case you just leave it. There is still a + sign but you can't add them b/c they're differ, one has a letter and the other doesn't. In that case you just leave it like, 18a+9.

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Gekata [30.6K]
Hmmmm judging by the values in between integers, like 2.5, 1.5, -2.5, -3.5 and so on, those values always produce a smaller number hmm that sounds whack... lemme put it differently.

a floor() function, namely ⌊x⌋ like that, will floor the decimal values, so ⌊2.5⌋ floors to 2, because 2.5 is between 2 and 3, and the smallest is 2, the "floor", the 3 will be the "ceiling".

so for a floor function, ⌊1.5⌋ is 1, 1.5 is between 1 and 2, 1 is the smallest, ⌊-3.5⌋ is -4, recall that on the negative side, the closer to 0, the larger, so -1 is much larger than -1000.

and say ⌊-1.35⌋ is -2, -1.35 is between -2 an -1 and -2 is the smallest, the "floor".

that said

x = 2.5      ⌊ 2.5 + 3⌋ is ⌊5.5⌋ which is 5

x = 1.5      ⌊ 1.5 + 3 ⌋ is ⌊4.5⌋ which is 4

x = -2.749   ⌊ -2.749 + 3⌋ is ⌊0.251⌋ which is 0

anyway and so on, so you can pretty much see is the floor function of ⌊ x + 3⌋.
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