3- Dada a expressão: = −±√
2−4
2
. Sendo a = 1, b= –7 e c = 10, os valores numéricos de
podem ser:
a) –5 e 2
b) –2 e –5
c) 2 e 5
d) 5 e –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?