H= 698 + 16t − 16t2. during what time interval (in seconds) will the ball be at least 26 ft above the ground? (enter your answer using interval notation.)

given: height as a function of h = 698 + 16t − 16t²   )

least height (h) =26 ft

now, from equation (i),

                  26 = 698 + 16t − 16t²

or,               t² - t - 42 = 0

or,             t² - (7-6)t - 42 = 0

or,             (t - 7) (t +6) = 0

so,                           t = 7 s or t = - 6s

we shall consider the only positive value of time because time will never be negative.

hence, the required time t = 7 s

therefore, the required height will be (26 ft, 7 s)

t = 9 + s is the expression for number of pages in terry's essay

Solution:

Given that, Terry's essay has 9 more pages than stacey's essay

Let "s" be the number of pages in Stacey essay

Let "t" be the number of pages in terry essay

To find: Expression for the number of pages in terry's essay

From given statement,

Terry's essay has 9 more pages than stacey's essay

Which means, number of pages in terry essay is 9 more than number of pages in Stacey essay

Therefore,

Number of pages in terry essay = 9 + number of pages in Stacey essay

Thus the expression for number of pages in terry's essay is found