Arational number that is equivalent to -20/4?

your answer would be -10/2 or -5/1.

This is because each of the numbers are equal to -20/4 so its the same. I just split each number in half, which is what you do to fractions to get an equivilent number, or to simplify, which is basically what i did here.

Hope this helps!!

Step-by-step explanation:

1/4 because there is 4 grades.

, 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