Find a formula for the nth term in this arithmetic sequence:

a1 = -7, a2 = -1, a3 = 5, a4 = 11, ...

an = [?]n +[ ]

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

In priyas math class there are 10 boys and 15 girls. what is the ratio of boys to girls in priyas math class? express your answer as a decimal

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.