# pre cal--check

21,762 results

pre cal
does anyone take pre-cal online ?

Science -- Check my Answer Plz
How much heat (calories) must be applied to a 100 mL beaker filled with boiling water in order to vaporize the water? ** A) 540 cal ** B) 540 * 10^4 cal C) 800 cal D) 8000 cal Is A correct? or cud it be B.?

sqrt2 /10 Do I just leave this as sqrt2/10 or can I reduce it to sqrt1/5?

Integrated Physics and Chemistry
The specific heat capacity of copper is 0.09 cal/g°C. How much energy is needed to flow into a 10-gram sample to change its temperature from 20°C to 21°C? A)0.009 cal B)0.09 cal C)0.9 cal D)9 cal

pre cal--check
Name all the values of x that are not in the domain of f(x) = (2–x^2)/ (x+ 5) I got only x= -5 because that's the only value that would make the denominator zero.

Pre Cal Check
focus: (0,p) vertex: if not given, then it is assumed (0,0) Directrix: k+p or k-p, i'm not sure I think these are the general equations for the focus, vertex, and directrix of a parabola, but i'm not sure. could someone please check this? thanks.

solve for r There is a right triangle with the hypotenuse as r , the angle as 45 degrees and opposite side as 20. I am having a hard time finding this out. I had tan 45 = 1.61 20(1.61) = 32.4 but this is wrong.

math
80 cal/g x 5 g 400g/cal or 400 cal/g not sure can any one help Neither. 80 cal/g x 5g = 400 cal. The unit g cancels to leave calories. x2+2x-15

Chemistry/Physics
How much heat is required to raise the temperature of 100 g of lead 20 degrees C? The specific heat of lead is 0.0305 cal/g K. A) 51 cal B) 61 cal C) 71 cal D) 81 cal

1)f(x) = -x + sqrt 4 - x^2 Find f(-2) -(-2) + sqrt 4 - (-2)^2 = 2 + sqrt 4 + 4 2 + sqrt 8 = 4.828 Is this correct?

Pre-Calculus
I'm trying to finish up my pre-cal homework and I am stuck on 2 problems... ***determine the intervals over which the function is increasing, decreasing, or constant*** 32. f(x)=x^2-4x 33. f(x)=√x^2-1 (that's square root of x^2-1) thank you so much for the help =)

Pre-Calculus
I'm trying to finish up my pre-cal homework and I am stuck on 2 problems... ***determine the intervals over which the function is increasing, decreasing, or constant*** 32. f(x)=x^2-4x 33. f(x)=√x^2-1 (that's square root of x^2-1) thank you so much for the help =)

Physics
A 150 gram golden (specific heat 0.03 cal/gram^0 C) spoon at 20^0C is placed in a cup of tea at 100^0C. The amount of heat which the spoon absorbs from the tea which is necessary to reach spoon's tempature 47^0C is a)360.4 Cal b)121.5 Cal c)78.24 Cal d)15.08 Cal e)157.5 Cal

I have to find the width of a river which is represented by a right trianle. The opposite side is labeled w and the adjacent side is 1oo ft. Theta is 54 degrees. Would my equation be opp = adjacent/cos(54)?

Science
A 50 gram ice cube is cooled to -10oC in the freezer. How many calories of heat are required to heat it until it becomes liquid water at 20oC? (The specific heat of ice is 0.5 cal/goC.) Answer A) 1250 cal. B) 4000 cal. C) 5000 cal. D) 5250 cal. Can someone please help me solve...

physics
A 50 gram ice cube is cooled to -10oC in the freezer. How many calories of heat are required to heat it until it becomes liquid water at 20oC? (The specific heat of ice is 0.5 cal/goC.) Answer A) 1250 cal. B) 4000 cal. C) 5000 cal. D) 5250 cal. Can someone please help me solve...

Chemistry
How much heat is released when 10 g of steam at 100°C is cooled to 10 g of liquid water at 100°C? I am working on a practice test and the answer is not in the back of the book. Can some one help me. 1. 10 cal 2. 5400 cal 3. 800 cal 4. 6200 cal

chemistry
How many calories are required to heat 25.0 g of platinum from 24.5 °C to 75°C (specific heat of platinum = 0.139 J/gK)? 1. 47 cal 2. 42 cal 3. 48 cal 4. 20 cal 5. 80 cal Thank you.

Pre-Cal
xy=2 {{x^2=3+y^2}}

Pre Cal
1 --------- 2x^2-2 --------------- 2 + x ---- ------- x+11 x^2-2x-3

pre cal
3(2x-1)^2 (2) (x+3)^1/2 + (2x-1)^3 (1/2) (x+3)^-1/2

Pre cal
ix^2-2x+i=0

Pre Cal
x 2 + y 2 = 0

pre cal
x^2+bx+ ?=(x+ ? )^2.

pre cal
(x/x-1)-(x/x+1) -2=0

pre cal
1/(x-1)- x/(x+1)-2=0

Physics
A substance has the following properties; Boiling Point = 140 °C, Freezing Point = -10 °C, specific heat as a gas, liquid and solid, 0.3 cal/g.C°, 1.8 cal/g.C° and 0.8 cal/g.C° respectively. Heat of fusion =100 cal/g and heat of vaporization = 480 cal/g. How much heat ...

pre - cal
12-5y^2 what's the question?

Pre-Cal
What are bearings??

pre cal
what is the sum of e or 1n

Pre Cal
Solve for x 2^x=8^x-3

pre cal
solve for x 8x-(2x-1)=3x-10

Pre Cal
What is the inverse of g(x)= 1/2(x-1)^3-4

pre cal
(y^2)^-4y^8 simplify

Pre-Cal.
How does this go from x^2+ to 2i, explain.

Pre-Cal
tan-1=43\9.3

Pre-Cal
2y=cos(4(t-6))+6

pre cal
f(x) = 3x + 5, g(x) = 6x^2 Find (fg)(x)

Pre cal
sin55=12/b what is b

Chemistry
Which of the following is the correct unit for specific heat? degree C*** Cal cal/g cal/(g*deg C)

pre-cal
find the value(s) of x for which f(x)=g(x). f(x)=x^4-2x^2,g(x)=2x^2

Pre-Cal (again)
If: f(x)= 3/x^2-1 g(x)= x+1 What is the domain of f, g, and f o g?

pre cal
What would cos2theta=-1/2 be???

Pre-Cal
Find f X g 3 sqrt of x+1 X x^3+1

Pre-Cal
Simplify e^3ln2-1

pre-cal
(576^1/2+512^1/3)^1/3

pre-cal
tan((theta/2)+(pi/6))=-1

Pre Cal
simplify the quotient: [x(5x+1)-3(x^2+1)]/ [(x-1)^2]

Pre Cal
cos^2+tan^2=1

Pre Cal
cos 75 deg

pre cal
7tan^2(pheta)-2=3

pre-cal
f(x)=((6xy^3)^1/2)((30x^4y^6)^1/2)/(5x^-7y^4)^1/2

Pre Cal
f(x) = log3(93 x + 3 815 x + 3)

pre-cal
find the intercepts of y=2x-4

Pre-Cal.
f(x)=x^3-3x^2+x-12 =x^2(x-3)+4(x-3) =x^2+4) (x-3) so if f(x) = 0 at x = 3,+/- 2i. what is the f(x) factored form

pre cal

PRE-CAL
SIMPLIFY 55/SQUARE ROOT OF 20 -3

pre cal
solve for x: x^(2/3)=(1/27) (2^(x)+4)/(2^x)=2 explain please

Pre-Cal.
Describe the end behavior of f(x)=2x^4-5x+1: A. x-->‡, f(x)-->‡; x-->-‡, f(x)-->-‡ B. x-->‡, f(x)-->‡; x-->-‡, f(x)-->‡ C. x-->‡, f(x)-->-‡; x-->-‡, f(x)-->‡ D. x-->‡, f(x)-->-‡; ...

Pre-Cal
solve(5-x)^-3=8 teach if possibe if not, its ok Thanks

Pre-Cal
Find the inverse of the function f(x) = 3^x+2

Pre-Cal
Identify any asymptotes of the graph. y = 1.08^5x

Pre-Cal
What is the domain of f/g? f(x) = x / x+1 g(x) = x^3 Please explain! Thank you

Pre-Cal
what about the domain of 1/x. Would it be 0?

pre-cal
solve this system of equation 3x-y+5z-2w=-44 x+6y+4z-w=1 5x-y+z+3w=-15 4y-z-8w=58

Pre-Cal
Find the domain for the function f(x)=-2x^(2)÷-x^(2)-6x-27

pre-cal
what is the vertex and directrix of the parabola y=-1/2x^2 + 10 - 46

pre cal
[root2(cos2pi/11+isin2pi/11)]^4

Pre Cal
the function y= tan (x/3) has an x intercept at?

pre cal 2
solve the equation 4cos^2x-1=0

Pre Cal
simplify the quotient: [(x+1)^3(4x-9)-(16x+9)(x+1)^2]/[(x-6)(x+1)^3]

pre-cal
Find B so that F(x)=-x^2+bx-75 has a maximum value of 25.

Pre-Cal
find the value of the function k(p/q)

Pre-cal
Does the equation x^2+x-12/x+2 have holes?

Pre-cal
10.2 can someone show me this graph(x+2)^2/4+(y+2)^2/15=1

Pre cal

pre-cal
solve the equation algebraically. 7e^x=11-e^-x

pre-cal
Find the real zeros of f (x)= 2x^3 + 2x^3 – 8x + 3

pre-cal
Find the real zeros of f (x)= 2x^3 + 3x^2 – 8x + 3

pre-cal
find the distance d (P1 P2) between the P1 and P2 P1=(-1,1);P2=(1,2)

Pre Cal
What is the phase shift of F(x) = 3 sin (2x - 2)?

Pre-cal

Pre-Cal.
write f(x) in factored form.

pre cal
Solve G(x) for the given domain. G(x) = 3x 2 - 2x - 1 G(6) =

pre cal
Find the inverse of the function. f(x) = x3 + 8

Simple pre cal
Is the relation a function? {(14, 9), (15, 8), (8, 7), (1, 9), (15, 2)}

Pre-cal
What is the area of triangle ABC if a = 19, b = 14, and c = 23?

pre-cal
How do you work inverse functions alebraically?

Pre-Cal
FIND A POWER WHOSE SUM IS: (a) 5 / (1-3x) (b) 9 / (1-4x) (c) 6 / (2-4x)

pre-cal
what are the steps to solve sec y sin (pi/2-y)=1

Pre-Cal
how do we put x^2-2y^2=4 into a standard equation???

Pre cal
Find the area of a triangle with sides of 12, 14 and 20

pre cal
convert the point to polar coordinates: (12,-12)

pre cal
convert the point to rectangular coordinates (7,1.75)

Pre Cal
simplify the expression 2sin^2 t + cos^2 t-2

pre cal
please help don't understand this...Assume f(x) = 2x + 8 and g(x) = 5. What is the value of (f + g)(3)?

Pre-Cal
Find the distance d(P1,P2) between the points P1 and P2. P1= (-2,1); P2= (0,0) P1= (-1,1); P2= (2,2) P1= (-1,0); P2= (2,4) P1= (2,-3); P2= (4,2)

Pre-Cal
Find the distance from point (-1, 3) to the line 5x- 4y= 10.

Pre-Cal
Find the domain of the function. sqrt of x^2-9

pre-cal
find the intercepts. y=2x-2 show work

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