154 CHAPTER 3
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a. The trend line estimates that the price was $432 in
November 2007 and $80 in September 2011. (That is an
interval of 46 months.) Use this information to determine
the slope of the trend line. Round your answer in dollars
per month to two decimal places. Be careful about the sign.
b. Use your answer to part a to determine by how much
the price of a Kindle should decrease every six months.
c. Use the information in part a to find a formula for the
price, in dollars, as a linear function of the time in months
since November 2007.
d. Use your answer to part c to determine the prediction
of the trend line for the price in July 2012 (56 months
after November 2007). What do you conclude from this
unreasonable result?
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29. Speed of sound in the ocean. Measuring the
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options a,b,c are the right answer.

step-by-step explanation:

a linear parent function is always represented as y = x

if we write this function in the form of y=mx+c

⇒

or  

now if we plot a graph we will find these characteristics:

1) y intercept of the graph is zero so its a straight line passing through origin.

2) as we can see in both the forms of function written, values of x and y may be either positive or negative for the positive slope means points on the graph are either in first quadrant or in third one.

3) it's slope is one.

about 0.75 hours

step-by-step explanation:

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

you ignore the remainder, therefore the answer is y = x+2

step-by-step explanation:

you have to divide the denominator by the numerator. you can use synthetic division or long division.

[-5] .     1 .     7 .     11

x + 2 + 1/x+5