Solve. 5x – 10 ≤ 20
a. (–∞, 2]
b. (–∞, 2)
c. (–∞, 6]
d. (–∞, 6)

option C (-∞,6]

Step-by-step explanation:

To solve the inequality we need to get x alone

To get x alone , add 10 on both sides

Divide both sides by 5

for , the solution is (-∞,6]

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