Please help me!! How to solve this problems?

Question

Question 1:
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The height h in feet of an object after t seconds is given by the function
h = –16t2 + 40t + 10.
How long will it take the object to hit the ground? Round your answer to the nearest thousandth.

Question 2:
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Find the constant term that should be added to make the following expression a perfect-square trinomial.
x2 + 2x

Question 3:
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Identify the axis of symmetry, create a suitable table of values, then sketch the graph (including the axis of symmetry).

y = –x2 + 3x – 3


Question 4:
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Identify the axis of symmetry, create a suitable table of values, then sketch the graph (including the axis of symmetry).

y = x2 – 4x

Question 5:
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The length of a rectangle is 1 cm more than 2 times its width

Answer 1

i would like to answer these for you, but you need to do your own homework..

if your having trouble find a tutor, most teachers offer tutoring after school or before school even begins..

if your afraid of getting rejected by the teacher (aka intimidated) find a friend to help you out... Preferably one that is doing well in the class...


I know you didn't want to hear this, but its better in the long run to do your own work or find hep with it, instead of relying on other people to do it for you..

Answer 2

Problem solving is two words, not a hyphenated word. Too many people try to hyphenate $#it that doesn't need hyphens. Yes, it's human relations. Then again, it's also English communications and computer operations.

Answer 3

q1
at the ground h = 0
so, 0 = 16t2+40t+10 , 0= -8t2+20t+5
t1 = (-20+sqrt(20^2+4*8*5))/-16
=(-20+sqrt(400+160)/-16
=(-20+sqrt560)/-16
=(-20 +23.664)/-16
=(3.664)/-16
=-0.229 sec, cant be consider, its negative time
t2=(-20-23.664)/-16
t2=(43.664)/-16
t2=2.729 sec, this is time object will strike the ground

q2
the constant is 1
x2+2x+1

q3
the graph is downward since a is negative

q5

l = 1 + 2w

Answer 4

//Answer 1://
0=-16t^2+40t+10
This gives:
t=(40+sqrt(40^2-4*16*10))/(2*16)
= 2.218 sec

Answer 5

You should ask each question separately;-}
we're not going to do all your homework for you.
These are quadratic equations; use the method shown.

Answer 6

All this for a crummy 10 points-fuggetaboutit!!