Abike store purchases bikes for $250 and sells for $625. what equation shows percent of change?

The equation which shows change of percent is :  

Step-by-step explanation:

The cost price of the bike = $250

The selling price of the bike = $625

Now, total Profit on the bike    =   Selling Price - Cost Price

= $625 - $250 = $375

So, the total profit on bike = $375 =Change in the price of bike

Now, to calculate percent of change :

=

Hence, the change of percent here is 150%

and the equation which shows it is :  

sorry not sure

step-by-step explanation:

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15