Which of the following is an example of correlation without causation?.

If (a, b) is the solution to the system of equations shown above, and a and b are integers, then what is the value of a+b?

Alaser tag arena sells two types of memberships. one package costs $325 for one year of membership with an unlimited number of visits. the second package has $125 enrollment fee, includes five free visits, and costs and additional $8 per visit after the first five. how many visits would a person need to use for each type of membership to cost the same amount over a one-year period?

Remote sensing of the earth's surface and atmosphere may involve the use of what type of instruments?