The percent of customers ordering coffee at McDonalds in 2009 increased 43% from 2008. If 7 percent of the customers ordered coffee in 2008, find the percent that ordered coffee in 2009.

7% ordered coffee in 2008

In 2009 it increased by 43%

New % = original% x ( 1 + increased %)

New % = 0.07 x (1 + 0.43)

New % = 0.07 x 1.43

New % = 10.01 % ( round as needed)

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

this answer is !