Area of a circle = πr^2
18 inches = 9 inches (radius)
A = π×9^2
A = 81π inches^2
Or...
A = 81×π
A = 254.5 inches^2 (1 dp)
You can use the desmos matrix calculator online! it’s a lot of help
Answer:
- 14 coins of 5p
- 11 coins of 20p
Step-by-step explanation:
<u>Given</u>
- 5p coins = x
- 20p coins = y
- Total = 2.90 = 290 p
- Number of coins = 25
<u>Equations</u>
- x + y = 25
- 5x + 20y = 290 ⇒ x + 4y = 58
<u>Consider the first equation in the second one</u>
- x + y + 3y = 58
- 25 + 3y = 58
- 3y = 33
- y = 11
<u>Then x is</u>
<u>Answer</u>
- 14 off 5p coins and 11 off 20p coins
I believe his brother is 4 at the moment, since 4*3 is 12. in 4 years John will be 16 and his brother will be 8, and 8 is half of 16. so 16?
Answer: 20.67
Hope it helps
