I need help please, I appreciate it!

Step-by-step explanation:

10.)

Sum of an arithmatic sequence

(n/2)(2a +(n-1)d)

n=4

a=13500

d=400

(4/2)(2*13500+(4-1)*400)=

2*(27000+3*400)=56400

11.)

equation: 42000(1.02)ⁿ⁻¹

d.) 42000(1.02)⁷=48244.79804

e.) Sum of a geometric series

f.)

I would negotiate it because inflation is increasing at a higher rate than my salary. This means that I will be getting paid less and less each year (assuming inflation stays at 2.3%)

I would ask for my salary to increase by 4% each year. I went to the best school in the entire universe and I feel like 4% is extremely fair