2 3/4- (-1/4)
Anyone have the answer ty

3

Step-by-step explanation:

Hi,

To begin, we have one mixed number and one fraction. In order to solve, we have to turn the mixed number into an improper fraction.

2 3/4 as an improper fraction is 11/4. We know this because we multiply the denominator by the whole number which is 4 x 2 = 8 and then add the result to the numerator which is 8 + 3 = 11. The denominator stays the same.

So...

11/4 - (-1/4)

- (-) always turns into a +. So when subtracting a negative, take those two subtraction signs, cancel them out, and add instead.

11/4 + 1/4 = 12/4

We can add straight across since they have the same denominator.

12/4 = 3

I hope this helps :)

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step-by-step explanation:

85.560%

step-by-step explanation:

conditional probability is defined as:

p(a|b) = p(a∩b) / p(b)

in other words, the probability that a occurs, given that b has occurred = the probability that both a and b occur / the probability that b occurs.

in this example:

p(turns 64 | turns 44) = p(turns 64 & turns 44) / p(turns 44).

if someone turns 64, they must have already turned 44, so:

p(turns 64 | turns 44) = p(turns 64) / p(turns 44)

on page 42, we see that of the original 100,000, 94944 turn 44, and 81234 turn 64.   therefore:

p(turns 64 | turns 44) = 81234 / 94944

p(turns 64 | turns 44) = 0.85560