He bill was $50 and the sales tax was 8.5%. Mary left a 20% tip on the amount after the sales tax was applied. How much did Mary pay in total?

His total was $65.10 with bill, tax, and tip after sales tax.

Step-by-step explanation:

Given:

Bill = $50

Tax = 8.5% or 0.085

Tip = 20% or 0.20

Solve:

$50 * 8.5% = $50 * 0.085 = $4.25

The tax equals $4.25.

$50 + 4.25 = $54.25

Bill with tax equals $54.25.

Key word is after the sales tax was applied:

$54.25 * 20% = $54.25 * 0.20 = $10.85

The tip after the sales tax equals $10.85.

$50 + $4.25 + $10.85 = $65.10

His total was $65.10 with bill, tax, and tip after sales tax.

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

(- 1, 0 )

step-by-step explanation:

an x- intercept is where the function crosses the x- axis.

to find the x- intercept/s look for the value of x when f(x) = 0

from the given table there are 3 values of x where f(x) = 0

when x = - 1, x = 2, x = 3

the one that is listed is (- 1, 0 )