So i don't really understand how to solve this.. here's the question.

the perez family arrived at tia elena's house with 6 gallons of gas. along the way, they first used 8 gallons and then added 10 gallons; then used 5 gallons. how many gallons of gas did the perez family start with? work backward, then solve.

here are the possible answers:

a) 3 gallons
b)7 gallons
c)9 gallons
d)11 gallons

On the first of each month, shelly runs a 5k race. she keeps track of her times to track her progress. her time in minutes is recorded in the table: jan 40.55 july 35.38 feb 41.51 aug 37.48 mar 42.01 sept 40.87 apr 38.76 oct 48.32 may 36.32 nov 41.59 june 34.28 dec 42.71 determine the difference between the mean of the data, including the outlier and excluding the outlier. round to the hundredths place. 39.98 39.22 0.76 1.21

Ageologist had two rocks on a scale that weighed 4.6 kilograms together.rock a was 0.5 of the total weight.how much did rock a weigh?

Kira looked through online census information to determine the overage number of people living in the homes in her city what is true about kira's data collection?