In order to join a dancing club there is a $30 startup fee and a $4 monthly fee. If you joined the club and spent $82, how many months did attend the club?
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13 months attended the club.

Step-by-step explanation:

Given:

In order to join a dancing club there is a $30 startup fee and a $4 monthly fee. If you joined the club and spent $82.

Now, to find the months attend the club.

Startup fee = $30.

Monthly fee = $4.

Total money spent = $82.

So, we deduct the startup fee from the total money spent:

The remaining amount is $52.

Now, we divide the monthly fee by the remaining amount to get the months attended:

Therefore, 13 months attended the club.

sine

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