Please help me answer this ASAP?

Question

Luisa organized a charity walk. In the first year, the walk generated $3000. She hopes to

increase this amount by $900 each year for the next several years. If her goal is met, what

is the total amount she will raise in 10 years?

Answer 1

S_n = (n/2)(2a₁ + (n - 1)d)

S₁₀ = 5(6000 + 9(900))

Can you complete and answer?