Answer:
C.8x - 16
Step-by-step explanation:
multiple 4 with 2x = 8x,
then multiple 4 with -4 = -16
add 8x and -16 the answer is 8x - 16
this formula, doesn't rely on a product, relies on a "sum", or is namely an arithmetic sequence, aₙ₋₁ -3 is another way of saying, the value of the previous term minus 3, so it relies on the ordinal value of a term, so is an recursive formula, well, let's get it when n = 4.

Unit rate would be 50 because 250÷5=50, so the answer would be (250×3)+50, witch is 800.
Answer:
17640
Step-by-step explanation:
at a discount of 10% per year $4900 is equal to $490 per year
payment started 6 years ago from now and ended 20 years from now
therefore there is an accumulation of 26 years
for 26 years = 26 *$490= $12740
present value therefore = $4900+$12740=$ 17640