8. Melissa's service charge at a beauty salon was $84.00 before tax. The sales tax rate was
8%. If she added 20% of the amount before
tax as a tip, how much did she pay for
the service at the salon?

$107.52

Step-by-step explanation:

8% of 84 = $6.72 in sales tax

20% of 84 = $16.80

She paid $84 for the service, plus $6.72 in tax, and $16.80

-10i^2-4i

step-by-step explanation:

evaluate for p=2,q=5i

(2−4)(2+5i)i

(2−4)(2+5i)i

=−10i2−4i

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!