For a party of 8 or more, some restaurants add an 18% tip on the bill. what is the total amount charged for a party of 10 if the cost of the meal, without tip, is $205? so far i have 205 x 1.18 which gives me the answer but i don’t know how to get the 1.18 can someone explain ?

The total amount charged with tip is $241.90   or  $242(approximately).

Step-by-step explanation:

Given:

Some restaurants add an 18% tip on the bill, a party of 10 has cost of the meal, without tip, is $205.

Now, to find the total amount charged with tip.

According to question:

Bill +  Tip

$205 + 18% of $205

So, the bill is $241.90.

Therefore, the total amount charged with tip is $241.90 or $242(approximately).

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