Which formula can be used to describe the sequence? f(x + 1) = –2f(x)
f(x + 1) = Negative one-halff(x)
f(x + 1) = One-halff(x)
f(x + 1) = 2f(x)

A3cm×3cm\greend{3\,\text{cm} \times 3\,\text{cm}} 3cm×3cm start color greend, 3, space, c, m, times, 3, space, c, m, end color greend rectangle sits inside a circle with radius of 4cm\blued{4\,\text{cm}} 4cm start color blued, 4, space, c, m, end color blued . what is the area of the shaded region? round your final answer to the nearest hundredth.

The product of (7x-2) and (20-3x)/4. when x=4

How do you figure out which order to do two step equations in? like which thing do you subtract/add/multiply/divide first? i understand that you do the opposite of whatever's shown on the opposite side, but when?