A projectile is launched into the air from the ground. the table shows the height of the projectile at different times. Projectile Height
Time (seconds) Height (meters)
5-1,353
10-2,460
15-3,323
20 -3,940
25 -4,313
30- 4,440
35- 4,323

Based on the data shown in the table, write a function to model this situation. After approximately how many seconds will the projectile hit the ground? 30 seconds :

: f(2)=1.1(36496.7)" :
: f(x) = -4.9x2 + 295x + 0.6 :
: f(x) = 30.2x + 0.6 :
f(x) = 36496.7(1.1)" :
: f(x) = 0.63x + 30.2 ::
f(x) = -16x2 + 295x + 0.6 ::​

Write a corresponding real world problem to represent 2x - 125=400

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

Ineed the answers for this one as well!