Find an explicit formula for the following sequence, an, which starts with a1=7. 7,−14,28,−56,112,…

aₙ= 7*(-2)ⁿ⁻¹

Step-by-step explanation:

7,−14,28,−56,112,…

This is a GP with first term of 7 and common ratio of -2

a₁=7

r= -2

aₙ= 7*(-2)ⁿ⁻¹

the last choice

step-by-step explanation:

x > 1.3

step by step:

8.5−0.9x> 9.8−1.9x

step 1: simplify both sides of the inequality.

−0.9x+8.5> −1.9x+9.8

step 2: add 1.9x to both sides.

−0.9x+8.5+1.9x> −1.9x+9.8+1.9x

1x+8.5> 9.8

step 3: subtract 8.5 from both sides.

1x+8.5−8.5> 9.8−8.5

1x> 1.3

step 4: divide both sides by 1.

1x/1 > 1.3/1