Lois has 36 colored pencils. they are either red or green. for every green pencil, lois has 3 red pencils. how many red enclosure does lois have?

Step-by-step explanation:

   The ratio of green to red is 1:3 which is the same as x to 3x where x is # of green pencils and 3x is # of red pencils. Equation: x + 3x = 36 4x = 36 x = 9 (# of green pencils) 3x = 3*27 (# of red pencils)

the probability is 0

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