16.9 The following data pertain to the chlorine residue in a swimming pool at various times after it has been treated with chemicals: Number of hours Chlorine residual (parts per million) 2.2 2 1.8 4 1.5 6. 1.4 8. 1.1 10 1.1 12 0.9 where the reading at 0 hour was taken immediately after the chemical treatment was completed. (a) Use the computing formulas on page 466 to fit a least-squares line from which we can predict the chlorine residual in terms of the number of hours since the pool has been treated with chemicals. (b) Use the equation of the least-squares line obtained in part (a) to estimate the chlorine residual in the pool five hours after it has been treated with chemicals. (c) Suppose you discover that the data for this exercise were obtained on a very hot day. Explain why the results of parts (a) and (b) might be quite misleading.

Q: Suppose you are playing a game of chance. If you bet $9 on a certain event, you will collect $225…

A: In this context, the winning price is $225 (including $5 bet). Therefore, the net winning price is…

Q: 55/5 +2

A: We will divide 55/5 first  Using long division 55/5=11

Q: 9+(_3)=

A:

Q: 3x5y8. V18x*y6 5,8

A:

Q: 8<3r-1<-1

A:

Q: x+6 x+5 + = 8 2 3.

A: Simplify the rational expression as follows, The common factor of the denominator is 6. So, multiply…

Q: State true or false  -p >= -p

A:

Q: hospital du

A:

Q: x + 5 > x-1

A: We need to solve inequality.

Q: Need help with (D)

A: Enter the data in Excel.

Q: 8/s-5=-8/7s-10

A: Given equation is

Q: 2/3 (6-3/2)

A:

Q: 5 mm 12 mm mm^3 Volume = 5 mm ww s 9 mm

A: Observation: cuboid on the top of other cuboid  Dimension of the cuboid in the down: Length…

Q: 4/5(-15/11)

A: The given fractions are,

Q: Simplify 3/z+5/x/6/z-9/x

A: To collect like terms and simplify the result

Q: Find and sketch the domain of the function In(x + y) f(x, y) 1– y?

A: From the given information. The function in x and y is as follows. fx,y=lnx+y1-y2

Q: ☐ О ☐ 4. Sketch the slope field for y = y-x 5 + 2 0

A: Step 1: Matlab code: % Define the differential equation dydx = @(x, y) y - x; % Create a grid of x…

Q: 124/(128)-3

A: Given : 124(128)-3

Q: Absolute Freq=12, 8, 10 then  Cumulative Freq=40% , x , 100%

A: Given:   Absolute Freq (f) Cumulative Freq   12 40%   8 x   10 100% Total 30

Q: 13 2/2

A:

Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.