The distance a train travels is proportional to time. in 4 hours, the train travels 380 kilometers. the relationship between distance and time can be represented as y= ox, where x is the time, in hours, and y is the distance, in kilometers. what is the value of k for this train ?

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?

Simplify. −4x^2 (5x^4−3x^2+x−2) −20x^6−12x^4+8x^3−8x^2 −20x^6+12x^4−4x^3+8x^2 −20x^8+12x^4−4x^2+8x −20x^6+12x^4+4x^3−8x^2