The function f(x) = –10(x)(x – 4) represents the approximate height of a projectile launched from the ground into the air with an initial velocity of 40 meters per second. how long, from launch to landing, does the projectile stay in the air?

a variable is any characteristics, number, or quantity that can be measured or counted. a variable may also be called a data item. hope i !

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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

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