Issac tosses a quarter off of a bridge, creating the shape of a parabola. The parabola can be represented by the equation h=-16t^2-4t+20

c. How high is the coin after .25 seconds?

d. After how many seconds does it land on the ground?

c) 18 units

d) 1 second

Step-by-step explanation:

h = -16t² - 4t + 20

c) t = 0.25

h = -16(0.25)² - 4(0.25) + 20

h = 18

d) -16t² - 4t + 20 = 0

4t² + t - 5 = 0

4t² + 5t - 4t - 5 = 0

t(4t + 5) - (4t + 5) = 9

(4t + 5)(t - 1) = 0

t = -1.25, 1

t = 1 second

the answer to the expression is 83

the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950