Statistics

In a bucket of 20 apples, 12 were green and the rest were red. 2 green apples are removed from the bucket. If one more apple is removed from the bucket, what is the probability that it is a Red apple?

12 people can dig a pond in 8 days. How many people can dig it in 6 days? Answer: 15

whats the cost to carpet the floor if carpet sells for 18 dollars a square yard. use proper conversions between the units for carpet and and the units for the floors area. how much floor space is there to cover and what will it cost. please show work im bad at math

x = 2 x + 2 = 4 --- eq (1) x^2 = 4 --- eq (2) eq (1) = eq (2) x + 2 = x^2 x^2 - x - 2 = 0 (x - 2) (x + 1) = 0 x = 2 or x = -1 sub x = -1 into eq(1), (-1) + 2 = 4 1 = 4 ??? sub x = -1 into eq(2) (-1)^2 = 4 1 = 4 ??? which step is wrong?

Best answer: By trial and error confirm that low primes like 3, 5, 7, 11, 13, etc are not a factor
Suspect it is that old chestnut, a product of 2 largish primes
The square root is about 299.
Primes < 299 in descending order, (from primes list) are:-
293, 283, 281, 277, 271, 269, 263, 257 ….

Test for products near 89701
293*306 = 89658, so not 293
283*317 = 89711, so not 283
281* 319 = 89639, so not 281
277* 324 = 89748, so not 277
271*331 = 89701 Bingo !

Best answer: You have to read the question very carefully. The total amount charged includes the original price and the 9.9% added tax.

So the question is asking for the original price.

If x is the original price, we are adding 0.099x and getting the charged amount of $118.69.

x + 0.099x = 118.69
(1 + 0.099)x = 118.69
1.099x = 118.69
x = 118.69 / 1.099
x = $108

Answer:
The price of the object (before tax was added) was $108.

Help. summer vacation homework of maths