Agroup of astronomers observed light coming from a star located a distance of 331,000,000,000,000,000,000,000,000 light-years from earth. what is this distance expressed in scientific notation?

a.
3.31 × 1026 light-years
b.
3.31 × 10-26 light-years
c.
3.31 × 1024 light-years
d.
3.31 × 10-24 light-years
e.
3.31 × 1025 light-years

The monthly texting plan of all star cell is $11 per month and $0.25 per text. the monthly texting plan of top line cell is $14 per month and $0.15 per text. a student wants to set up a system of equations to find the number of texts for which the total monthly cost of the two companies is the same. he uses the variables x and y. he lets y represent the total monthly cost. what will x represent? x = number of texts x = cost of the total number of texts x = total monthly cost x = cost of each text