How many terms of arithmetic sequence 3;11;19 will add up to 1580​

Maria donates a fixed amount, a, to a charity each month. if she donates $300 in 12 months, what is the equation for a? a. a + 300 = 12 b. a × 300 = 12 c. a × 12 = 300 d. a + 12 = 300 e. a + 32 = 100

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?