Ca2Br2 +
Na(CO3) -+
Ca(CO3)
+
NaBr

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?

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse

Two numbers have a sum of -19. one number is x. what expression represents the other number?