Brandie

Can anyone verify my solutions are correct for this question? Thanks in advance!!!

25. You are conducting a survey at a college with 800 students, 50 faculty members,

and 150 administrators. Each of these 1,000 individuals has a single listing in

the campus phone directory. Suppose you were to cut up the directory and pull

out one listing at random to contact. What is the probability it would be (a) a student,

(b) a faculty member, (c) an administrator, (d) a faculty member or administrator,

and (e) anyone except an administrator? (f) Explain your answers to

someone who has never had a course in statistics.

Probability is calculated by figuring the possible successful outcomes divided by all possible outcomes.

A. 800/1000= .80 or 80% or 4/5

B. 50/1000= .05 or 5% or 1/20

C. 150/1000= .15 or 15% or 3/20

D. 50+150/1000= .20 or 20% or 1/5

E. 1000-150/1000= .85 or 85% or 17/20

F. To find the probability of each of these answers you would start by dividing the possible successful outcomes (the category or categories you want) by the total number of possible outcomes. In example A take 800 college students which is what you are trying to see the likely hood of choosing and divide by the possibility of the 1000 listings. This would give you a .8, when multiplied by 100 it will give you a percentage, and if reduced as a fraction the probability of this many successful attempts per actual attempts. In the example E, the question asked for anyone except an administrator, therefore, taking the total amount of people minus the administrator will give you a category for those you want to have picked. After that, you would resume as if you had the successful possibilities divided by all possible outcomes.

I have a paper to write and cannot come up with something to write long and detailed.

I am taking the exam on September 4th, and was wondering if there is anything I have forgotten. If there was something on the exam that you thought hard or just many questions of I would appreciate any pointers. Thanks in advance!

Cal Grant is the grant, and does anyone know when they usually send it out?

I am having a hard time figuring out how to write the linear function for my exam.

In 1990, the life expectancy of a males in a certain country was 72.5 years. In 1996, it was 76.1 years. Let E represent the line expectancy in year t and ler t represent the number of years since 1990.

The linear ffunction E(t)= ? t + ?. Rounded to the nearest tenth.

Then using the function to predict the life expectancy of males in 2008.

E(18)= ?

For this I came up with 83.3 years, however, I did not use the formula, can anyone explain how to write the formula and how to figure the solution this way?

Thank you!

Solving by elimination, I came up with more than one solution for these, is this correct or is there an ordered pair?

3r-5s= -37

5r+3s=29

I came up with r =1 but then s can be 8 or -8 so this is indefinite correct? Or if not would you explain. Thanks!

5/2x+1/4x= 7/4 + x

5/2x+1/4x-x=7/4

10/4+1/4x-4/4x=7/4

11/4x-4/4x=7/4

7/4x=7/4

divide both sides by 7/4

x=1

Is this correct?

5/3 x (2/3)= I don't know if this is mean to be confusing but I got the solution of 10/3. Is this correct?

Lord knows I don't even know where to start...

These are my options for answers...

A. {x!x is a real number and x is not = to 0}

B. {x!x is a real number and x is not = to 3/7}

C. {x!x is a real number and x>= 3/7}

D. {x!x is a real number and x is not = to 1}

Another question while I am at it...

Solving -0.9x< -81

Should the solution look like {x! 90} or something else?

A line at (9,6) and (10,-10).

Is the slope -16/1?

Or do I have this completely backward?

To find the indicated output for f(0), f(-1), and f(2).

f(x)=5x squared -2x.

I came up with 0, 27, and 96.

I just want to make sure you multiply the 5 by x then square it.

Thank you!

Solving by substitution.

6x+7y= - 20

x=24-8y

I come up with (0,3) which makes the first equation incorrect, this makes it no solution, correct?

The product of 38% and some number.

N= some number

N x .38= X

My 5 yr old daughter constantly is having bloody noses. Does anyone know what may be causing this? Any ways to prevent this?

The doctor says it is because we are in the desert and it is very dry, but they come on all times of the year, any time of the day and even when she sleeps (without her knowledge).

1. To solve and graph.

6-4x>=18 and 6x-1>29

I came up with {x!x-3>=x<5

the graph should look like this..

<----------]-3 and 5(---------->

2. If plan A insurance plan was first $180 and 30% of the rest and plan B was $190 and 25% of the rest.

I would save with plan B if I had more than x in medical bills.

I came up with x>=$330.

3. The graph and solution in interval notation for

x<6 and x>=-3

answer: [-3,6) and the graph would look like -3[-------------)6

5. Two angles are complementary. The sum of the measure of the 1st angle and 1/4 the second is 66.75. Find the measures of the angles.

I came up with 31 and 59.

6. Solve 2y-1<6y-4

Answer: {y!y> 3/4}

7. Solve 9/10 (7+2x)+2>=14

Answer: {x!x >= 57/18}

8. Determine if 9, -17, -16, and -1 are solutions to y-9>2y-2

Answer: 9No, -17Yes, 16Yes, and -1No

11. 46- (2x+1) <= 3(x+5)x

Answer: {x!x >=5} It says to round to the nearest tenth, so I think this may be wrong. :(

13. Elimination of x+8y=39 and -x+5y=13

Answer: (7,4)

I really appreciate your taking the time to help me out. If you find any mistakes would you be kind enough to explain why they are wrong? Thank you in advance!

a) The sales representative informs you that there are two floor plans still available, and that there are a total of 56 houses available. Use x to represent floor plan #1 and y to represent floor plan #2. Write an equation that illustrates the situation.

x+y=56

b) The sales representative later indicates that there are 3 times as many homes available with the second floor plan than the first. Write an equation that illustrates this situation. Use the same variables you used in part a.

y=3x

c) Use the equations from part a and b of this exercise as a system of equations. Use substitution to determine how many of each type of floor plan is available. Describe the steps you used to solve the problem.

x+3x=56

4x=56

Divide both sides by 4

X=56/4 or 14

Since x =14

y=3(14)=42

there are 14 available houses of floorplan #1

there are 42 available houses of floorlplan #2

d) What are the intercepts of the equation from part a of this problem? What are the intercepts from part b of this problem? Where would the lines intersect if you solved the system by graphing?

Part a =

Part b= (0,0)

Intersection is (14,42)

I can't figure if I did part c correctly and I cannot figure out part d, a, and am quite unsure b may be wrong.

Can you help me with an explanation? Thank you!

I don't know how to solve this problem because there is no assignment given to the first set of variables.

x+y=38

175000x+200000y=7200000

Use elimination to determine how many houses with each floor plan are available.

Can anyone explain this to me. I cant eliminate anything if there is no equally reciprocated number, can I?

If x moving company charges an $80 set up fee plus $35 per hour fee, and y charges no set up fee and a $55 an hour fee. For what values h (hours) does y offer the better deal. My question is how to write this in an inequality, and if you would be willing to explain.

I already know both companies are equally priced at 4 hours, I am just confused how to write it in an inequality form. So far I have written it x<= 4h <=y, is this correct?

y= -1/2x-4

Complete the table for this equation.

x Y (x,y)

-2.5 -1 (-2.5,1) -1 is the corrrect

-2 -3 (-2,-3) -2 is the correct

0 -4 (0,-4) -4 is the correct

2 -5 (2,-5) 2 is the correct

8 -8 (8,-8) 8 is the correct

Is having common sense something you gracefully learn throughout the years? If you don't have it, is it a genetic deficiency for the ability to learn?