More adding and subtracting mixed numbers anybody know? : p

first one is 7 4/15

second one is 1 11/12

Step-by-step explanation:

7. 4 7/15 + 2 4/5

Find the common denominator for 2 4/5 which is 15. Multiply by 3 for the numerator and denominator.

(4)(3)/(5)(3)=12/15

4 7/15+ 2 12/15=6 19/15= 7 4/15. ( subtract the numerator with the denominator 19-15=4)

7 4/15

10 . 3 1/4-1 1/3

Find the common denominator for both of the fraction which is 12.

Multiply by 3 for 3 1/4. ( only for the numerator and denominator)

(1)(3)/4(3)=3/12

Multiply by 4 for 1 1/3.  ( only for the numerator and denominator)

(1)(4)/(3)(4)=4/12

3 3/12- 1 4/12

Make the fractions into improper fractions. Multiply the whole number with the denominator.

3 3/12= 3*12=36. Add 36 with the numerator. 36+3=39

1 4/12=16/12

39/12-16/12=23/12=1 11/12

1 11/12

the answer   is 200

step-by-step explanation:

this is a problem about poisson probabilities.   i don't know if you've

already studied poisson distributions, or if you have a place to look

to read more about the subject.  

here's how you can see a poisson distribution coming.   when there are

a lot of events that may happen at any time (or any place), and when

you're counting how many of them happen at a particular time (or a

particular place), and each event is independent of the others, then

the result is a poisson distribution.   this is roughly true for the

chocolate chips; one chip being in a cookie has only a small effect on

the probability that another chip will be in the cookie.

once you know you have a poisson distribution, you know a lot.   there

is only one parameter to a poisson distribution, so if you know the

mean, you know everything.   the form of the distribution is

  probability of n chips = {[e^(-x)]*(x^n)} / (n! )

is there a picture

step-by-step explanation: