# Pre- Calculus

21,152 results, page 40

### pre calcu

A ball is droped out of a window of a tall building. If it hists the ground 3.5s later, how high aboe the ground is the window?

### Pre-Algebra [urgent!]

I can't find the solution to this problem; can someone please show me how to solve it step-by-step? Solve the equation for y in terms of x: 1. -8x + 5y = 10 Thanks! -MC

### Pre-Algebra

Here are some more of those same type of questions as my other posts: x - 6= y (12,6) (10,4) (8,2) 2x - y= 10 (5,0) (6,2) (7,4) 4y - 3x = 12 (8,3) (0,3) I NEED ONE MORE FOR THIS ONE Thanks! -MC

### Pre-Cal

Find the component form of v given its magnitude and the anlge it makes with the positive a-axis. v=3 v in the direction 3i + 4J Would the component form be (3,4)?

### pre calc

suppose beta is an angle in the second quadrant and tan beta=-2. Fine the exact vaule of sin beta and cos beta

### Pre-cal

Please determine the following limit if they exist. If the limit doe not exist put DNE. lim 2x^3 / x^2 + 10x - 12 x->infinity. Thanks.

### pre-cal

Use logarithms to solve log 8 / log x < 1. I understand that there are 2 cases: when x is negative or positive. I don't understand how it affects the answer though.

### pre algebra

the measure of the angles of triangle RST are the ratio 2:3:5. find the measure of each angle, and classify the triangle as acute, right or straight

### Pre-Algebra

Can anyone show me step by step how to solve this problem? 26cm/s = m/min convert this problem using dimensional analysis.What is the answer and how did you get it?Thanks,kj

### pre-algebra-is my answer right

Rewrite the expression without using a negative exponent. 4z^-4 Simplify your answer as much as possible. is this right? (1/4z^4)

### Pre Algebra

Find the Original Amount: NEW AMOUNT: 210 75% INCREASE **please help me as soon as possible and explain steps please!**

### Pre Chem

How much heat will be produced when 16grams of C2H6 burns? The reaction is 2 C2H6 + 7 O2 --> 4CO2 + 6 H20 triangle heat = -350kJ

### pre calc

The minute hand of a clock is 7 inches long. How far does the tip move in 16 minutes? a.56/15pi b.8/105pi c.4/105pi d.28/15pi

### pre-algebra

One side of a rectangle is 6 in and the other side is x inches. Find the possible value of x if the area must be at least 84 sq inches.

### Pre-Calc

Evaluate the expression without using a calculator(show work please)? (sin pi/4 cos pi/6 - sin pi/6 cos pi/4) the answer is 1/4(2-ã3)

### pre-ap math

the diagonal of a rectangular poster is 25 in. The width is 15 inches. If madison wants to put a border on the edge of the poster , how many inches will she need to buy?

### pre calc

Find all solutions of the equation 3sin^2 x -7sin x +2 = 0 in the interval [0,2pi). The answer is x_1= ?? and x_2= ?? with x_1<x_2.

### geometry

if a scale factor of four is used, the points in the image will be eight times as far from the origin as at he pre-image points true or false

### Pre-Alegebra

A 25 foot tall flagpole cast =s a 20 foot shadow. If a man with a height of 6 feet stands nearby, what will be the lenghth of this shadow?

### Pre algebra

25ft piece wire cut into 2 pieces one piece is 19ft shorter than the other piece how long was each piece

### Pre-cal

The equation of the line joining the complex numbers -5 + 4i and 7 + 2i can be expressed in the form az + b*overline{z} = 38 for some complex numbers a and b. Find the product ab. Any help?

### Pre-Calc.

Change the exponential statement 5^x=125 into an equivalent logarithmic statement. I know the answer is log5(125)=(x) Just don't know the steps to get it.

### pre-calc - JAI

A statement Sn about the positive integers is given. Write statements S1, S2, and S3, and show that each of these statements is true. Show your work. Sn: 2+5+8+...+(3n-1)=n(1+3n)/2

### pre algebra

it took us 3 hour to drive to a concert.on his way home he increased his speed by 19 miles got home in 2 hours . what was the speed

### pre calc

A statement Sn about the positive integers is given. Write statements S1, S2, and S3, and show that each of these statements is true. Show your work. Sn: 2 is a factor of n2 + 7n

### pre calc

A statement Sn about the positive integers is given. Write statements S1, S2, and S3, and show that each of these statements is true. Show your work. Sn: 2 is a factor of n2 + 7n

### pre-algebra

The width of a rectangle is 30 centimeters. Find all possible values for the length of the rectangle if the perimeter is at least 768 centimeters.

### Pre-Calc

Verify the identity. Show your work. cot2x + csc2x = 2csc2x - 1 1+cosec^2x +cosec^2x Cot^2x+cosec^x= 1+2 cosec^2x Would this be correct?

### pre-algebra

A submarine at the surface dives 375 ft and then another 175 ft. Express the final depth as an integer. A. –525 ft B. –550 ft C. 550 ft D. 525 ft C?

### Pre-Cal

Suppose that cosx= -3/5 and x is in the third quadrant, and that siny= 2/9 and y is in the second quadrant. Find the exact values 1). tan(y/2) 2). cos(x+y) 3). tan(x+y)

### math

Please does anyone have ANSWERS for the UNIT 7 LESSON 8 SYSTEMS OF EQUATIONS AND INEQUALITIES? FWI: It's Algebra 1 NOT PRE algebra please if I fail I'll get an F!!!!!!!

### Pre calc

sin(θ − ϕ); tan(θ) = 5/12 θ in Quadrant III, sin(ϕ) = − sqaure root 10/10 ϕ in Quadrant IV I tried this numerous times can somone please help me

### pre-calc

A statement Sn about the positive integers is given. Write statements S1, S2, and S3, and show that each of these statements is true. Show your work. Sn: 2 is a factor of n^2 + 7n

### Pre- Algebra

If you were to roll a fair number cube 120 times, how many times would you expect to roll a 4 based on theoretical probability

### Law

Please check my answer thanks :) A pre trial conference most likley would occur before dicovery begins but after the complaint is filed True or False I said True

### Pre-Cal(Urgent!!)

Find all the solutions of the equation in the interval (0,2pip) sin(x + pi/6) - sin(x -pi/6) = 1/2 I am only stuck on the last part. I have 2sinx(sqrt3/2) = 1/2 Does the 2 cancel out with the sqrt 3/2. I am not sure what to do.

### pre calc

i have to use the inverse of tangent to find a missing angle in a triangle. the know sides are x+1 and 10. since i am using tangent, it should be arctan theta=x+1/10 my question is how do i solve this? i don't want the answer just HOW.

### pre calc

how do uu find the x int. , y int. , domain range asytote of this equation y=log to the base 10 (2x+3/x-5) pleaseee need to understand before the test tmr!!!! No one has answered this question yet.

### Pre-Calc

A wrecking ball attached to a crane swings back and forth. The distance that the ball moves to the left and right of its resting position with respect to time is represented by the following graph.

### Pre-Algebra

Can someone PLEASE explain to me what the formula is for finding the surface area of a pyramid? I am on this lesson from my school and I can't quite understand what the formula is. If you can also give an example of a problem, that would be great! :)

### Pre-Calc

How do you do this? A farmer has 336 feet of fencing and wants to build two identical pens for his prize-winning pigs. The pens will be arranged as shown. Determine the dimensions of a pen that will maximize its area.

### Pre-Calc

A slice 1 unit thickness is removed from one see of a cube. Use the rational zeroes theorem and synthetic division to find the original dimensions of the cube, if the remaining volume is 48 cm^3 v= x^3 v=x*x*x x=(x-1)*x*x 48=(x-1)*x*x

### Math (pre-celc 12)

I'm not sure how to get the final answer for this question I get stuck halfway thru. Simplify using sum and difference identities: cos((3pi/2)-x) I think the answer is supposed to be -sin(x) Thanks!

### Bio physics chemistry pre medical

Vitamin a has a molecular formula c 20 h 30 o. How much no of molecules will vitamin a contian in 500mg capsule? ? Plz tell me now tomorrow is my test .I will be very grateful of u. .

### Bio physics chemistry pre medical

Vitamin a has a molecular formula c 20 h 30 o. How much no of molecules will vitamin a contian in 500mg capsule? ? Plz tell me now tomorrow is my test .I will be very grateful of u. .

### PRE-CAL

Factor the trigonometric expression. There is more than one correct form of the answer. cot^2 x + csc x − 19 NOT SURE WHETHER TO REPLACE THE COT WITH COS^2X/SIN^2X THEN CSCX TO 1/SINX?

### Pre-cal

Solve (in radians) sec x = 2csc x When I work it out, it gets to 2cot x - 1 = 0 cot x = 1/2 Would it be ok to use tan^-1 (2) ? I must demonstrate it with a graph as well... would the line go through Q I/III or II/IV ? Thank you!

### Pre-calculuc-check answer

Which is true for the graph of f(x)= -x^3+3x-2? Answer: relative maximum at (1,0) 2) Determine between which consecutive integers one or more real zeros of f(x)= 3x^4+x^3-2x^2+4 are located. Answer: -1 and 0

### Pre-Calc

A pilot of an airplane flying at 12,000 feet sights a water tower. The angle of depression to the base of the tower is 25°. What is the length of the line of sight from the plane to the tower?

### pre-calc

How do you solve this equation? the square root of x-3 minus 3 times the square root of x+12 equals -11.

### pre-calc

the sum of the two squares of two consecutive even integers is 1,648. what are the integers?

### Pre Cal.

Solve 3y^2 + 4y - 2 greater than/equal to 0 3y^2 + 4y - 2 ≥ 0 3y^2 + 4y - 2 = 0 y = [-4 ± sqrt (4^2 - 4(3)(-2)]/(2 • 3) = (-4 ± sqrt 40)/6 = (-4 ± 2 rad 10)/6 = (-2 ± rad 10)/3 Is this right?

### Pre Calc

I need to graph the function, y = log(root 3)2x I did...now I need to graph the inverse. What is that?

### pre-cal

Solve (x+2)/(x+1) -2 < 0 I know the LCD is x + 1. (x+2-2x-2)/(x+1) < 0 (-x )/(x+1) < 0 But somehow, I got the wrong answer. The answer is (4, 7]. But I don't know where I went wrong.

### pre-algebra

the length of a rectangle is 10 inches more than its width. what are the dimensions of the rectangle if its perimeter is 80 inches?

### pre cal

assume the angle is in the first quadrant, and sin theta equals 1/5. what is sin 2 theta?

### Pre Algebra

I am having problems with inequality problems. The opposite of g is at least -5. Write an inequality and solve.

### Pre cal

1.Find the domain of the function algebraically y=3x-1/(x+3)(x-1) y=(1/x)+5/(x-3) 2.Find the range of the function y=10-x^2 y=(3+x^2)/(4-x^2) Please help me understand how to do them.

### Pre-Calc/Trig...

Am i correct? The graph of y=3x^2-4x+2 opens downwards. FALSE The graph of y=2x^2-4x+2 has a y-intercept of (0,1). FALSE

### Pre Algebra

Chad jogs 4 2\5 miles in 1\2 hour. What is his average speed in miles per hour?

### Pre-Algebra

Ashley bought a dress at 30% off. The sale price was $59.50. What was the original price of the dress?

### pre algebra

the typist typed end of page 8 till the end of page 50. what would the pages be.

### pre cal

Find the angle between the vectors u and v if u = (-1,4) v = (3,-4) a. 155.93 b. 158.58 c. 158.13 d. 155.24 e. 157.17

### 8th pre algebra

solve for x 2x-7=13 subtract 7 to both sides divide by 2 both sides x=10..am i right?

### pre-al

If you roll a standard number cube 42 times, how many times do you expect the cube to show a six or an eight?

### pre algebra

23/144 + 13/144 =

### Pre Calc

√(x+2) -7 =√(x+9)

### Pre Calc

tan(tan-1 7.4)=?

### pre calc

log(x^2+2x-3/x^2-4)-log(x^2+7x+6/x+2)

### Pre-Calc

Log(x-6) +Log(x+3)=1

### pre cal

6x^2−4x+ ?=6(x− ?)^2.

### Calculus-math

If g(x) is the inverse of f(x), g(x)=f^-1(x), such that g(3)=5 and f'(5)=4 what is the value of g'(3)????? :O 2. If g(x)is the inverse of f(x), g(x)=f^-1(x), such that f(3)=15,f(6)=3,f'(3)=-8,and f'(6)=-2. What is the value of g'(3)???????? Calculus--

### Calculus POSTS please check

Please check my calculus posts. They are at the bottom. Thanks.

### pre-algebra

x+5/4=3/4x The next step would be obtained by subtracting 3/4 x + 5/4 from both sides. That gives yoju x/4 = -5/4 Now multiply both sides of the equation by 4.

### pre alg.

In a pattern, the # of colored tiles used in row x is 3 to the power of x. Find the number of tiles used in rows a, 5, & 6. i don't get this problem & could use some help...

### pre algebra

Is this how I would multiply? like if you have a whole number 3and 1/2yd multiplied by 4yd. Would I first multiply the 4x3 = 12 and 1/2? or no?

### Pre Cal (logs)

I need help with these logs 1: Log underscore4 16X 2: 2 Ln ( X(sqr. root)e 3:5^[2logUnderscore5(3x)] 4:log underscore2 ^[1280-logunderscore2 5) I don't understand how to do them thanks

### Pre- Caluculus

Find the time at which the depth of the water in the tank is eual to half its initial depth. D(t)=sqrt(100-2t) the tank is empty when t=50 min

### Pre-Cal

Find f X g , g X f , and f X f f(x) = 3sqrt x-1 g(x) = x^3 + 1 For f(x) the 3 is little above the sqrt sign. My answers were: f(g(x)) = 3sqrt x^3 + 1 -1 g(f(x)) = 3sqrt (x-1)^3 -1 f(f) = 3sqrt x-1-1 My teacher said these were wrong. Please help. I do not know how to correct ...

### Pre-Cal

Find f X g , g X f , and f X f f(x) = 3sqrt x-1 g(x) = x^3 + 1 For f(x) the 3 is little above the sqrt sign. My answers were: f(g(x)) = 3sqrt x^3 + 1 -1 g(f(x)) = 3sqrt (x-1)^3 -1 f(f) = 3sqrt x-1-1 My teacher said these were wrong. Please help. I do not know how to correct ...

### Pre Calc

Derive the equation of the locus of all points that are equidistant from the point F(-3,4) and the line y=-2. Leave your answer in general form. [General Form: ax^2+by^2+cx+dy+e=0]

### pre-calc

A hall 100 feet in length is to be designed as a whispering gallery. If the foci are located 21 feet from the center, how high will the ceiling be at the center?

### Pre-Cal

From a point 50 feet in front of a church, the angle of elevation to the top of the steeple is 48 degrees. Find the overall height of the church and steeple.

### Pre algebra

The width of a triangle is x-3 and the length is 2x-1. Write and solve an equation to find the perimeter and area of the rectangle if the measures of its length and width are in a 1:3 proportion

### pre calc

Over the course of a year, the number of hours of daylight in Australia is modelled by H=12+3 cos(2pi/365 *t) where t is the time in days and T is the number of daylight.

### Pre-Calc

if (0,-7) lies on the terminal side of angle theta in standard position, find each value sec(theta) , cot(theta) and sin(theta)

### Pre-Algebra

6. If on the scale of a map, 3⁄4 inch equals 72 miles, what is the actual distance between 2 cities that are 3 7⁄8 inches apart on the map?

### pre algebra check

The measures of two angles of a triangle are given. Tell whether the triangle is acute, right, or obtuse. 19°,35° I think its obtuse

### Pre cal

Three digits are randomly selected without replacement for one 1, two 9's and one 6. What is the possibility that the three digit number is a multiple of 3?

### pre-ap Algebra 2

write a polynomial function f of least degree that has the rational coefficients, a leading coefficient of 1, and the given zeros. Given zeros: -2,2,-1,3, sqrt 11

### Pre-Cal

Christian is solving the equation x2 – 12x = 4 by completing the square. What number must be added to both sides of the equation to complete the square?

### Pre-cal

Convert from DMS to Radians 1) 61degree 24' 2) 75degree 30' Convert from Radians to Degress 1) 2 2) 1.3 Please help how to solve and calculate it in calculator. I got confused. :( :)

### pre alg

a 9 ft ladder is leaning against a wall so that Adam can hang a picture 7.5 ft above the floor. how far does the ladder need to be placed from the wall?

### AP pre Cal

Forces with magnitudes of 45 N and 90 N act on an object at angles of 20 degrees and 115 degrees respectively, with the X-axis. Find the magnitude of the resultant of these forces.

### Math

calculate the rate percentage per year if $3240 is paid as intrest on 12000 for 2 and a half years. whats percentage pre year?

### Pre-Cal

Find all Real solutions of the Equation: (ENter as comma sparated answers, if there are no real solutions then just leave as NRS) x^(4/3)-9x^(2/3)+14=0 x=?

### pre algebra

Beth's savings account has $100 to start. She deposited $12 Monday, withdrew $50 Tuesday, and deposited $30 on Friday. What is her total savings now?

### pre algrebra

thank you, Scott or whomever simplify the square root if 108 ok. I got 9x12 which then prime factorization = 2.2.3.3.3 then i get it means the square root of 2.2.3.3.3 but then i get stuck thank you

### pre calc

Take out the spaces: h t t p : //img 151. imageshack. us/my.p hp?image=graph bb0. png 1)I need to find the intervals on which it is increasing, decreasing, or constant 2) whether it is even odd or neither 3) domain and range