A coin bank contains $17.00 in pennies and nickels. If there are 1140 coins in the bank, how many of them are nickels? (solving with elimination or substitution)

Step-by-step explanation:

p=1140-n

.01p+.05n=17

.01(1140-n)+.05n=17

11.4-.01n+.05n=17

.04n=17-11.4

.04n=5.6

n=5.6/.04

n=140 the number of nickels

1140-140=1000 pennies

hope it helps!

justin bieber ml.

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