12 dived by what is 7? answer me i really need on my math homework

Set it up like an equation and solve:

12 / x = 7
12 = 7x
x = 12/7 or 1.714285714

Hm, already some algebra for an elementary student. Huh. 

Well anyway, onto the problem! 

12/n

n represents the phrase "some number"
As n can be any number that solves the problem. Now we need it to equal 7. Because we want 12 divide by the number, n to equal 7. 

12/n = 7

To solve this problem we need to solve for n. To do so we need it alone so the problem looks like this: 
n = whatever the answer is. 

To remove something from a problem you have to use something called the inverse operation. I'll go over them quickly.

Operation : Inverse Operation
Addition : Subtraction
Subtraction : Addition
Multiplication : Division
Division : Multiplication

There are a few more, but those will do for this problem! 

12/n = 7 

n is stuck in the denominator because it is dividing a number, so to remove it we simply multiply both sides by n. 

12/n * n = 7n

12n/n = 7n

Now the n variables on the left will cancel out. (Because n/n = 1. Same as any number such as 9/9 equals 1. Or 4/4 equal 1. Or 100,000/100,000 equals 1).

12 = 7n

Divide 7 on both sides to get our answer! 

12/7 = 7n/7

Same deal with the 7s. They will cancel out because they equal 1. 

12/7 = n 

Our answer is: 
n = 12/7

12/(12/7) = 7

Let's check it!

When you divide something by a fraction you flip it and then multiply across. Like a so. 

12*(7/12) = 7

(12*7)/12

The 12's will cancel out leaving us with 7. 

7 = 7 

It checks out! 
 

Num of plants = (original#ofplants)*(1.6)^t

Answer: 900°

good luck on your studies! : )

david edward.