Sally is making a model of the White House for her American history class. She decides to use red ribbon for wallpaper borders. The first room needs 170 centimeters of ribbon. The second room needs 130 centimeters of nbbon. Each meter of ribbon costs $5. How much money does Sally need to buy ribbon for her model?
(Hint: 1 meter - 100 centimeters)

Marlow is comparing the prices of two trucks rental compaines company a charges $3 per hour and an addtional $75 as serivce charges company b charges $2 per hour and an additional $85 as serivce charges

The function a represents the cost of manufacturing product a, in hundreds of dollars, and the function b represents the cost of manufacturing product b, in hundreds of dollars. a(t) = 5t + 2 b(t) = 7t - 2t +4 find the expression that describes the total cost of manufacturing both products, a(t) + b(t). a. 7t^2 - 7t + 2 b. 7t^2 + 3 +6 c. 7t^2 + 7t - 6 d. 7t^2 - 3t + 6

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15