circles area and circumference
If the Radius of a circle is 7 then what is the circumfrance?
25.12
Explanation:
I used Pie r squared to get my anwser. First I multiplied the radius by 2 then I multiplied that by pie.
A recipe for apple pie calls for 3 cups of flour and 6 eggs. If Maya has 12 eggs that she wants to use. how many cups of flour does she need?
6 cups of flour.
Explanation:
The ratio for cups of flour to eggs is 3:6 since Maya wants to use 12 eggs which is 2 times 6 I multiplied 2 by 3 which gave me 6 cups of flour.
What is 5(3x-1) + 4
15x-1
Explanation:
Using the distributive property I first multiplied 5 by 3x which equals 15x and I multiplied 5 by -1 which equals -5. Then I added -5 to 4 which is equal to -1. After this I got my final answer which was: 15x-1.
What is 50% of 40?
20
Explanation:
50% means half so I divided 40 by 2 which gave me 20.
If the diameter of a circle is 24 then what is the area of the circle?
452.16
Explanation:
I used pie r squared. First I divided the diameter by 2 which gave me 12. Then I did 12 squared which is 144. And the final step is multplying 144 by pie (3.14).
Jacobs teacher told Jacob that for every 3.6 times he calls out he has to sit out for recess 1 time. If Jacob called out 63 times today how many recesses does he have to sit out?
17.5
Explanation:
Knowing that the ratio is 3.6:1 I knew that I would have to divide 63 by 3.6 which gave me my answer, 17.5.
What is equivalent to 2(8x-2)?
16x-4
Explanation:
Using the distributive property I multiplied 2 by 8x which equals 16x and then I multiplied 2 by -2 which equals -4. This gave me 16x-4.
Bob wants to buy a belt. If the belt costs $20 and it is 25% off how much is it after the discount?
15
Explanation:
First I did 25% of 20 which is 5. I then subtracked that from 20 which got me my anwser.
If the Circumfrance of a circle is 53 then what is the radius of the circle?
8.44
Explanation:
first I needed to find out what pie times what equals 53. I divided 53 by 3.14 and got 16.88 (which would be the diameter) Then I divided 16.88 by 2 which gave me my anwser.
At a camp there are 2 counselors for every 12 kids. This year there are 540 kids that are coming to camp. How many counselors is there going to be?
90
Explanation:
Using the ratio 12:2 I first found out what times 12 equals 540. To do this I divided 540 by 12 and got 45. So if I multiplied 12 by 45 to get 540 then I need to multiply 45 by 2 as well which gave me 90.
If x=70 then what is 9x+45?
675
Explanation.
Knowing x=70 I did 9 times 70+45 which gave me 675.
Mary has 50 marbles. She wants to give 40% to Jack. 20% to Kate. 30% to Olivia, and 10% to Peter. How many marbles does Kate get?
10
Explanation:
I did 20% of 50 and got my anwser.
If the radius of a circle is 4.7 divided by 2 what is the Area of the circle?
17.3
Explanation:
Using pie r squared I first needed to find out the radius so I divided 4.7 by 2 and got 2.35. Then is did 2.35 squared which gave me 5.52. Finally I multiplied 5.52 by pie and got my anwser.
For every 500 art books there are in a library there is 700 science books. If there are 1,500 art books how many science books are there?
2,100
Explanation:
To get 1,500 from 500 you would have to multiply 3 by 500 so you have to do the same thing to 700.
If x+x=b and b is equal to 63 what is x?
108
Explanation:
First I figured out what 63 is so I can know what b is. B=216. Then I divided b by 2 (which gave me 108) because if x+x=b and there are 2 x then I must figure out what each of the x is equal to.
If a shirt is $89 but its 5% off how much is it?
$84.55
Explanation:
First you need to find the discount amount and subtract it from the original price. The discount amount is 4.45. One is subtracted that from 89 I got my final answer.
If the Circumfrance of a circle is 129.97, what is the radius of the circle?
20.69
Explanation:
Using 2 pie r I first found out the diameter by doing 129.97 divided by pie (3.14). The diameter would be 41.38. Then I divided the diameter by 2 to get the radius which is 20.69.
For every 1 chereo box there is 457 chereos. How many boxes would you need for 9,789?
21.40
Explanation:
To get your answer you need to divide 9,789 by 457.
What is 6(7+9x+9b+1)
43+54x+54b
Explanation:
First I multiplied 6 by 7 which is 42 then I did 6 times 9x which is 54x then I did 6 times 9b which is 54b and then I added 1 to 42.
If 25% of X is 15 what is X?
60
Explanation:
We know that 25% of X is 15. First I converted 25% into a decimal to solve for X and got 0.25. 0.25 times X = 15. Then I divided bothe sides by 0.25 and got that X=60.