4. Evaluate the geometric series given a1 = 4, r = -2 and n = 12

we know that

a1=7

r=2

n=14

then

Sn=a1*[(r^n)-1]/(r-1)>S14= 7*[(2^14)-1]/(2-1)=114681

the answer is 114681

i assume that by 5 you mean 5 gallons.

(20)(0.25) = 15

removing 15 gallons reduces the tank from 20 to 5.

the highest percentage for deaths in construction from highest to lowest is as follows: falls, struck by objects, electrocution, and caught-in/between. these four are collectively known as fatal four.

in the case of falls, the type that is responsible for the overall highest death in the category is falls from roofs.