Alex saved 30% of his paycheck last month. He earned $240. How much did he save?

$72.00

Step-by-step explanation:

240 × 0.30 = 72

to check this, you can divide 72 ÷ 240 = 0.30

to turn a percentage into a decimal, all you have to do is divide it by 100

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb

a. is correct