A rock was thrown from the top of a cliff that its distance above sea level was given by s(t)=at^2 + bt +c , where t is time in seconds after the rock was released. After 1 second the rock was 63 metres above sea level, after 2 seconds 72 m and after 7 seconds 27m. Find an expression for s(t).

step-by-step explanation:

let

we know that

the y-intercept is the y-coordinate of the point when the value of x is equal to zero

so

the y-coordinate of the point a is the y-intercept

the answer part a) is

the value of y-intercept is

part b) find the slope m

we know that

the value of the slope is equal to

substitute the values

therefore

the answer part b) is

the value of the slope is equal to

the general answer is

the slope is

the value of y-intercept is

853.3

step-by-step explanation:

step by step explanation: when u removing the parentheses and combined them that would be : x+3y-x-y=2y