Answer:
30
Step-by-step explanation:
30 percent of what number is 9?
9 is 30% of 30
Working out percentages
We have, 30% × x = 9
or,
30
100
× x = 9
Multiplying both sides by 100 and dividing both sides by 30,
we have x = 9 ×
100
30
x = 30
If you are using a calculator, simply enter 9×100÷30, which will give you the answer.
answer:
how many can are needed to move?
Step-by-step explanation:
Answer:
See below.
Step-by-step explanation:
because we combine like terms. You will essentially ignore the x and just do -2 + 1, which is -1. So, the answer would be -1x which is simply just -x.
To see why we can combine like terms, use the distributive property. So we have:
This is the same thing as saying:
Factor out the x:
Add:
And simplify:
Answer:
5
Step-by-step explanation:
7+8=15
15 x 3 = 45
45/9=5
Answer:
1/10
13/100
4/5
12/25
3/10
63/100
3/5
51/200
2/9
5/11
To prove the last 2 recurring ones:
0.222222... = x
10x = 10 * 0.22222... = 2.222222....
Notice how the decimal part of 10x is the same as for x:
10x - x = 2.2222222... - 0.222222... = 2
10x - x = 9x = 2
x = 2/9
Same procedure for the other one but times by 100 instead:
x = 0.454545...
100x = 45.454545...
100x - x = 45.454545... - 0.454545... = 45
100x - x = 99x = 45
x = 45/99 = 5/11
