Five friends went on a road trip and kept track of how long each of them spent driving.
what percent of the driving was done by sheng?
write your answer using a percent sign (%).

answer: -1

step-by-step explanation:

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for

yes

step-by-step explanation:

they have to be opposite and reciprocal of eachother.

parallel lines have the same slope. so if the green line has a slope of -4, the slope of the red line is also -4.