A random sample of 20 round trip flights between Philadelphia and Dallas has an average airfare of $470.40 with a sample standard deviation of $58.70. The 95% confidence interval around this sample mean is .

for this case we have that by definition, the volume of a cylinder is given by:

where:

r: it's the radio

h: it's the height

we have as data that:

substituting:

so, the cylinder volume is

option d

48+y= ?

the y is the variable and the ? could also be a variable  

i think this is a open ended question but i agree with other guy who said you should ask it at english section

set the two equations for y equal to each other. solve for x. this will be the x-coordinate for the point of intersection. use this x-coordinate and plug it into either of the original equations for the lines and solve for y.