Johann borrows money from his parents to purchase a bike. he makes weekly payments to his parents to repay the money borrowed. the amount of money repaid can be represented using the recursive formula an=50+an-1. during the fourth week, johann repaid his parents $175. how much total had johann repaid after the first week, a1?

$ 25

Step-by-step explanation:

Given: The amount of money repaid can be represented using the recursive formula , where n is the number of week.

Since during the fourth week, Johann repaid his parents $175.

Thus,

Now,  

Hence, the total which Johann had repaid after the first week = $ 25

ou would have 12 of each

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