Rosana used linear combination to solve the system of equations shown. she did so by multiplying the second equation by a certain number to eliminate the y-terms. what number did rosana multiply the second equation by?
x - y= 15
0.5x + 0.2y = 25

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

Solve this problem! extra ! 3025/5.5 = a/90.75 / = fraction