Add 10 to both sides so that the equation becomes 5x^2 + 11x - 2 = 0.
To find the solutions to this equation, we can apply the quadratic formula. This quadratic formula solves equations of the form ax^2 + bx + c = 0
x = [ -b ± √(b^2 - 4ac) ] / (2a)
x = [ -11 ± √(11^2 - 4(5)(-2)) ] / ( 2(5) )
x = [ -11 ± √(121 - (-40) ) ] / ( 10 )
x = [ -11 ± √(161) ] / ( 10)
x = [ -11 ± sqrt(161) ] / ( 10 )
x = -11/10 ± sqrt(161)/10
The answers are -11/10 + sqrt(161)/10 and -11/10 - sqrt(161)/10.
Answer:
The number of bicycle that store sell each month to break even is 13 bikes .
Step-by-step explanation:
Given as :
The operation cost of bicycle store = $2400
The cost of payment by store at average rate = $60 per bike
The average selling price of each bike = s.p = $120 per bike
Let The number of bicycle that store sell each month to break even = n bikes
<u>According to question</u>
The operation cost of bicycle store = (cost of payment by store at average rate + average selling price of each bike ) × number of bicycle that store sell each month to break even
i.e ($60 per bike + $120 per bike) × n bikes = $2400
Or, ($180 per bike) × n bikes = $2400
∴ 180 n = 2400
Or, n = 
i.e n = 13.333 ≈ 13
So, The number of bicycle that store sell each month to break even = n = 13 bikes
Hence, The number of bicycle that store sell each month to break even is 13 bikes . Answer
so 5 people work each one for 21 minutes, that means 21+21+21+21+21 minutes altogether, namely 105 minutes, it took that long for 7 walls, hmmmm how long for just one wall then? well, 105 ÷ 7, namely 15 minutes then, for just 1 wall.
now, if it takes 15 minutes of work to do one wall, what about 5 walls? well, that'd be 15*5 or 75 minutes.
so if we have 3 folks working, how much would each one work? well, 75 ÷ 3, namely 25 minutes, so each of them will work 25 minutes, namely 25+25+25 minutes, so in 25 minutes, they'll be done with 5 walls.
36100/36789=0.9812715757427492