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\(d\; \alpha\; t^2\\ d=kt^2\\ find\;k\\ 80=k*4^2\\ k=5\\ d=5t^2\\ after\;12\;sec\\ d=5*12^2\\ d=720m\\ 720-80=640 \)

So in the next 8 sec the ball will drop 640m

Hey, this is a copy of CPhill's answer! And, this is asking for the consonants. 

Assuming that we can have "non-sense" words

We could have  a word with an "A"  and this letter could appear in any of 4 positions......and we could choose any of the other three consonants to occupy a second positon, then any two of the consonants to occupy a third position, and the last consonant would appear in the last position by default.......so we have

4 * 3 * 2 *1  =      24 words using just the A  and the other three consonants

The same result would occur if we just used the "E" and the other three consonants

If we used the "A"  and the "E," we would have 24 words using any two of the other consonants......but, we could choose any 2 of the 3 remaining consonants.....so   the total "words"   would be  24 * (3C2)  = 24 * 3  =  72

So....the total number of words would  be 24 + 24 + 72  =  120 "words"

IIf we have non-real roots, the discriminant must be < 0

In the form

ax^2 + bx + c = 0

The discriminant is   b^2 - 4ac

So  b = b     a = 1    and c = 9       ... so.....

b^2 - 4 (1) (9)   < 0

b^2 - 36 < 0

b^2 < 36

The interval that makes this true is

-6 < b < 6

Thank you Melody!!!

7/16 x  = pencils where  x = total number of writing instruments

7/ 16 x  + 1  = 5/12 (x+4)

21/48  x + 1 = 20/48 x + 80/48

1/48 x = 32/48

x = 32    pencils+ pens originally  

7/16 (32) = 14  pencils originally   ... and you found one more    = 15

the questions isn't explain nor answered

the question isn't explained

d = kt^2

So

80 = k(4)^2

80 = 16k      divide both sides by 16

5 = k

So....in 8 more seconds....t = 12 and we have

d = 5 (12)^2

d = 5 (144)

d = 720

So....the didtance it falls in the next 8 seconds [ after the first 4] =  720 - 80 =  640 ft

Because h is proportional to the square of v. We have to input 20 for v and square it to get 400. 35^2=1225. We can make a proportion 8/400=x/1225. When we simplify we get 1/50=x/1225 When we cross multiply we get 50x=1225 and divide both sides by 50 we get x=24.5

We have this

h = kv^2     so we need to find  "k"

And we know that

8 = k (20)^2

8 = k (400)    divide both sides by 400

8/400 = k  =   1/50

So....when v = 35

h = (1/50) (35)^2   =  24.5 m

Because it is proportional to the respected numbers square. 4^2=16 and because it is proportional 80/16=5. We have to square 8 to get 64 and then multiply that value by 5 to get 320. 

Because it is proportional to the respected numbers square. 4^2=16 and because it is proportional 80/16=5. We have to square 8 to get 64 and then multiply that value by 5 to get 320. 

Because it is proportional to the respected numbers square. 4^2=16 and because it is proportional 80/16=5. We have to square 8 to get 64 and then multiply that value by 5 to get 320. 

Correct!!!!

Correct!!!

Correct....!!!!

Correct, NSS....!!!!

Good job....and thanks, tertre....!!!!

RE is correct....!!!!

R and E?