-4-8 -12
--------= -------= -3
-2+6 4
Answer:
$67.20
Step-by-step explanation:
84 x .05
4.2
84 x .25
21
84-21
63
63 + 4.2
67.20
Answer:

Step-by-step explanation:


















Hence, the correct answer is 
1) a. Socratics, chegg, khan academy
1) b. They all learning apps that help you understand problems if any subject. It also has online tutors to help you.
2. To insert a square root, just type \sqrt and then the Enter or Tab key to insert the square root symbol.