Narancia Ghirga

Which of the following is a complex fourth root of -16? I got 2(cos90°+isin90°) Is it okay?

Find the sum of the first 30 terms of the sequence: -1, 1, -1, 1, -1, … I got -1 is it okay?

Write the arithmetic sequence that has three arithmetic means between -16 and 16. I got -16, -8, 0, 8, 16 is it okay?

Find the sum of a geometric series with the following values: a1=3; r=2; n=10 i got; 2,880

Write the geometric sequence that has five geometric means between 1and 15,625. I got: 1, 5, 25, 125, 625, 3,125, 15,625, … is it ok?

Write the mathematical expression that describes the arithmetic sequence. Use sigma notation to describe the sum of the first ten terms of the arithmetic sequence 20, 18.5, 17, 15.5, 14, (the difference is from -1.5) Help, please!

Suppose you deposit $10,000 into a savings account with 3.5% compound interest compounded each month. Find the account balance in 50 years. Round the answer to the nearest thousand dollars. Help

Which of the following is another representation of the polar coordinate P=3,45° ?

Thanks Reiny, I have problems with maths

I got -3,225 is it okay?

In my exercises, the only answer appears as 61(cos5.2+isin5.2) and sqrt61(cos5.2+isin5.2)