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natta225 [31]
3 years ago
9

8miles in 1 hour write an expression of the total distance

Mathematics
2 answers:
vodomira [7]3 years ago
6 0

Answer:

F(x)=8h

Step-by-step explanation:

the h= hours so like it says 1 hour just do

f(x)=8(1); f(x)=8 miles

if 2 hours

f(x)=8(2); f(x)=16 miles

hope this helps

Brilliant_brown [7]3 years ago
5 0

Answer:

f(x)=1x·8= total distance

Step-by-step explanation:

f(x) is a function

1= hour

x= how many hours

8= miles

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Answer:

These type of questions are super tricky b/c you have to remember all the different versions of the identities, and then they put the question in some odd form,  I feel like this should land math professors in jail , for dishonesty , b/c it's really a form of "how tricky can I make a question and still have a way to solve it"   anyway,

Step-by-step explanation:

a)

next the question asks   1-cos 2A   and this is total abuse of notation.   the way this should be written is   1- cos( 2A)  so we know that the A is part of the cosine functions input... btw.. in any computer program,  it would never ever let you get away with that top form of the expression.  :/   anyway... I keep ranting.. huh... sorry  :P

1-cos(2A) is an odd form of the identity  1/2(1-cos(2A) = sin^{2}(A)  the 1/2 is missing but we can add that pretty easy, we just have to remember to take it out too. I usually forget to do that. and my professor marks me off completely,  totally wrong, but I just miss one small thing  :/  anyway....

our 1-cos(2A) needs the 1/2 added to it.  or if we move that 1/2 to the other side it looks like  2*sin^{2}(A)  = 1-cos(2A)  and this is that "odd" from of the identity that I was talking about.  

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now our fraction looks like  [2* sin^{2}(A)] / 2 sin(A)cos(A)

so cancel out one of the sines

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cancel the 2s

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nice  it worked out  :P

b)

by the above that we just worked out, then

Tan(15) = Sin(15) / Cos(15)

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back to our problem,  the 2√2 will cancel out

then we have

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