(y-3)^2 -4y +12 = 0
[y^2 -6y +9] -4y +12 =0
y^2 -10y + 21 = 0
(y -3) (y-7) =0
y=3 ; y = 7
Simplify both sides of the inequality.
−16x+8<2x+5
Subtract 2x from both sides.
−16x+8−2x<2x+5−2x
−18x+8<5
Subtract 8 from both sides.
−18x+8−8<5−8
−18x<−3
Divide both sides by -18.
−18x/−18 < −3/−18
x>16
Ans : x > 16
Answer: C.) 1.12 seconds
Step-by-step explanation:
Hi, to answer this question we have to substitute h=0 (when the rock hits the ground the height above it is 0) in the equation given:
h (t) = –16t2 + 20
Solving for t (time)
0= –16t2 + 20
16t2=20
t2=20/16
t=√1.25 =1.12 seconds (option C)
Feel free to ask for more if needed or if you did not understand something.
I think it’s C sorry if I’m wrong
