Halp! it's for my math homework! i will make it a ton of pts! the gas of your car is 40% full. there are 8 gallons of gas in a tank. what is the capacity of the gas tank? in advance!

Step-by-step explanation:

Percentage by which the gas tank of the car is full = 40%

Amount of gas in the gas tank = 8 gallons

capacity of the gas tank = x gallons

40% * x = 8

(40/100) * x = 8

4x/10 = 8

4x = 8 * 10

4x = 80

x = 80/4

Answer   = 20 gallons

d. 24+-0.114

step-by-step explanation:

the question requires us to calculate the approximate 95% confidence interval for the mean number of ounces of ketchup per bottle in the sample given the following statistics;

sample mean = 24

standard deviation, σ = 0.4

sample size , n = 49

the confidence interval for a population mean is calculated using the formula;

sample mean ± z-score*(σ/sqrt(n))

the z-score associated with a 95% confidence interval, from the standard normal tables, is;

1.96

substituting these values into the formula;

24 ± 1.96*(0.4/7)

= 24 ± 0.112

from the alternatives given, choice d is closest to the above expression;

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.