Please help me break down the equation to get to the right solution. Thank you!

1. The total revenue and total cost function that faces firm A are:

TR=10Q

TC=100+5Q+0.02Q^2 (Note: Q^2 is q-suared)

What is Firm's A marginal revenue (MR)?

Select one:

a. 20Q

b. 10

c. 200Q

d. 2Q

2. The total revenue and total cost function that faces firm A are:

TR=10Q

TC=100+5Q+0.02Q^2 (Note: Q^2 is q-suared)

What is firm's A marginal cost (MC)?

Select one:

a. 5+0.04Q

b. 50-0.04Q

c. 50+0.04Q

d. 5+4Q

3. The total revenue and total cost function that faces firm A are:

TR=10Q

TC=10+2Q+0.01Q^2 (Note: Q^2 is q-squared)

What is firm's A profit maximizing quantity (Q)?

Select one:

a. 25

b. 400

c. 1250

d. 50

4. The total revenue and total cost function that faces firm A are:

TR=10Q

TC=10+2Q+0.01Q^2 (Note: Q^2 is q-squared)

What is firm's A profit?

Select one:

a. -$1,590

b. $159,000

c. $159

d. $1,590