Joey earned $10 for every car he washed on Friday. If he earned $190, how many cars did he wash?
1 answer:
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Since it does not include 0 in the inequality, nor does it include any numbers below 0, it must be 
.
3x²+x-5=0
a = 3, b = 1, c= -5
-> ∆ ( delta ) = b²-4ac = 61 > 0
-> x1 =( -b+√∆ )÷ 2a =...
x2 = (-b-√∆)÷2a =...
p/s: do your teachers teach you how to use ∆ ( delta ) in maths calculation ? i live in europe and our teachers teach us that way. however, it is a rịght and fast way. you should learn it.
