Solve the following system of equations by substitution and select the correct answer below:

2x − 4y = 24
4x − 12y = 36

x = 18, y = 3

x = 18, y = −3

x = −18, y = 3

x = −18, y = −3

The circumference of a circle is 5 pi cm. what is the area of the circle?

Data are collected to see how many ice-cream cones are sold at a ballpark in a week. day 1 is sunday and day 7 is the following saturday. use the data from the table to create a scatter plot.

Tod does not have any cookies. david gives jeff 8 cookies. then he splits half of the cookies he has left with tod. david let’s c represent the number of cookies that he starts with. he finds the number of cookies that tod has is 1/2 the difference of c and 8. write an expression to represent the number of cookies that tod has.