ANSWER ASAP PLEASEEE Brenda took one of her friends out to lunch. The lunches cost $70 and she paid 10% sales tax. If Brenda left a 10% tip on the $70, how much in total did she pay?

$84

Steps:

70 * 10%

70 * 0.10 = $7 sales tax

70 * 10%

70 * 0.10 = $7 tip

$70 lunch cost + $7 sales tax + $7 tip = $84

give more details

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