8) 12 carrots for $ 4.80. how much for 1?

$0.40

Step-by-step explanation:

12/4.30= 1/?

12/4.30= .40

1 carrot costs $0.40

Step-by-step explanation: The formula you would use in this situation is something like

n * c = t, where n is the number of items, c is the cost, and t is the total.

If 12 * C = 4.80, where c is the cost of 1 carrot, then:

C = 4.80/12

C = 0.40

So the cost of 1 carrot is $0.40

Don't forget to check your work by plugging in your result into the original equation:

12 * 0.40 = ?

12 * 0.40 = 4.80

Hope this helps.

Cheers,

Andy

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