Jayne stopped to get gas before going on a road trip. the tank already had 4 gallons of gas in it. which equation relates the
total amount of gasoline in the tank, y, to the number of gallons that she put in the tank, x?
o
y=4+x
y = x-4
y = 4.x
y = x + 4

The first and the last answers are the same so technically they are both right. Are you sure you copied them down correctly?

I'm assuming the last one because that is how an equation of a line is written in slope-intercept form.

y = x + 4

Step-by-step explanation:

It looks like it could be the first or last one, since the ttal amoutn of gas is going to be whatever she puts in the tank plus what was already there.  and x+4 = 4+x

he earned 78.75 in interest.

step-by-step explanation:

irst, find the z score of a score of 80. this is given by the formula z = (x-u)/o, where x is the score, u is the mean, and o is the standard deviation. this gives

z = (80-78)/12 = 1/6 = .1667

now, find what percentile a z score of 1/6 correlates to in the normal distribution.

a z score of 1/6 = .1667 is equivalent to the 56.36th percentile of the distribution. so the probability a score is over this is 1-.5636 = .4364

the mean of a sample mean is equal to the original mean. however, the standard deviation of a sample mean is equal to the original standard deviation divided by the square root of n (sample size). so the new standard deviation is 12/sqrt(16) = 3.

the new z score is 80-78/3 = 2/3 = .667. this is equivalent to the 74.86th percentile. so the probability that the mean will be greater than this score is 1-.7486 = .2514.