Noah and his friend tyree are involved in a math challenge.

noah solves 115 problems in 2 min.
tyree solves 172.5 problems in 3 min.
who solves more problems per minute?

question 5 options:

a)

noah solves more per minute

b)

tyree solves more per minute

c)

they solve the same number of problems per minute

d)

not enough information

c) They solve the same number

Step-by-step explanation:

find the rate of problems per minute by

dividing 172.5 by 3 to get 57.5

dividing 115 by 2 to get 57.5

4400

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