# Algebra II quiz

### JavaScript with alert box only (no AJAX or C#).

1.) What can we say about the first term in an arithmetic series?

It is always 1.

It cannot be 4.

It cannot be 10.

It can be any number!

2.) An arithmetic series has t1=1, tn=11, n=11. What is its sum?

Not enough information - what is d?

110

55

66

3.) An arithmetic series has t1=1, d=4, n=11. What is its sum?

40

440

231, since tn = 1+(10*4) = 41.

Unknown, since we don't know tn

4.) An arithmetic series has t1=1, tn=49, n=10. What is its sum?

500

250

275

Unknown, since we don't know d

5.) An arithmetic series has d=2, tn=50, n=10. What is its sum?

390

820

410, since t1=tn-9*2=50-18=32.

Unknown, since we don't know t1

6.) An arithmetic series has t1=32, d=2, tn=50. What is its sum?

390

820

410 (tn-t1=(n-1)*d->50-32=(n-1)*2->n=10)

Unknown, since we don't know n