Food bill before tax: $40
sales tax: 8% tip: 17%​

answer: $50.00

step-by-step explanation:

org. price- $40.00

10% - $4.00

1% - $0.40

8% - $3.20

tax - $3.20

10% + 8% - 1% = 17%

4.00 + 3.20 - 0.40 = 6.80

tip - $6.80

$40.00 + $3.20 + $6.80 = $50.00

answer:

see below.

step-by-step explanation:

the standard deviation   =   √   (∑(x - 10)^2 / 8 )   must be approximately = 1 if we take the mean to be 10.

this requires ∑ (x - 10)^2 to be approximately equal to 8.

the following   data set would fit the bill:

8.6   9   9   10 10   11   11   11.5.

the values of (x - 10)^2   could be 1.96, 1, 1, 0,0, 1, 1, 2.25 = 8.21

this would give a mean of about 10 and standard deviation of about 1.

answer:

c. 1/5, -2

step-by-step explanation:

we are given the following equation and we are to solve it by factorizing it:

we are to find factors of -10 such that when multiplied they give a product of -10 and when added they give a result of 9.

therefore, the correct answer option is c. 1/5, -2.