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Question 174478: 84. confirm the identity cos^4x-sin^4x=cos2x
Click here to see answer by jim_thompson5910(28476)

Question 174456: 24. find the exaxt values of sin2u cos2u tan2u
cosu=-2/3
Click here to see answer by rapaljer(4667)

Question 174477: 24. find the exact values for sin2u cos2u tan2u
cosu=-2/3
Click here to see answer by rapaljer(4667)

Question 174475: 6. find the exact value of trigonomic fucntion sec2x sin=3/5
cos=4/5
Click here to see answer by rapaljer(4667)

Question 174454: 6. find the exact value of sec2x
Click here to see answer by Alan3354(30959)

Question 174454: 6. find the exact value of sec2x
Click here to see answer by rapaljer(4667)

Question 174441: 18. write the expression as the sin,cos,tan
sin140cos50+cos140sin50
Click here to see answer by rapaljer(4667)

Question 173041: Please can someone help me figure out how to solve these problem's i started it but got stuck.
Find all solution's for each triangle.If no solution exist, write none.Round to nearest tenth.
1.a=125,A=25,b=150
2.a=32,c=20,A=112
Thank's for the help.
Click here to see answer by midwood_trail(310)

Question 173155: sorry, these problems aren't from a textbook. I've started these four problems then just started going in circles to find the answer.
1.)Solve for x, where x is between 0 and 2pie
tan^(2)x-tanx-3=0
2.)verify the identity:
sinx/1-cos=cscx+cotx
where 0 3.)evaluate:
cos[sin^(-1)(3/5)]
4.) Given that sin theta =1/2, theta in Q1 and cos beta =1/2, find cos (theta-bata)
much appreciated!!

Click here to see answer by Edwin McCravy(8880)

Question 174621: 3. if one root of a function is 1/2 - 2i, what is the equation of this function?
(a) 4x^2 - 17x + 4 = 0
(b) 4x^2 - 4x + 17 = 0
(c) x^2 - x + 17 = 0
(d) 4x^2 + 4x + 17 = 0
show work thanks!

Click here to see answer by stanbon(57219)

Question 174620: hi my trig teacher gave me this problem can you help me solve it?
Graph:
f(x)=4(2.5)^x

Click here to see answer by stanbon(57219)

Question 174663: 5) Crossing a wooden bridge at Letchworth Park, Melissa drops a penny into the water below for good luck. If the height of the penny is modeled by the function h(t)=64 - 16t^2, where t represents time in seconds and h(t) is height in feet, how many seconds did it take the penny to hit the water?
(a) 1 (b) 2 (c) 3 (d) 4
Show work thank you !
Click here to see answer by nycsub_teacher(90)

Question 173039: Please can someone help me with these problem's i tried and tried but i cant figure it out.
Round to the nearest tenth if necessary.
1.K=40 and k=26. Find L,j,and l.
2.j=65 and l=55. Find K,L and k.
3.Solve for triangle ABC. Round to nearest tenth if necessary.A=30,B=45,and a=10.
Please I would greatly appreciate help with these problem's.
Click here to see answer by nycsub_teacher(90)

Question 174664: 9) If the roots of a quadratic equation are real, irrational, and unequal, which of the following might be the discriminant of that equation?
(a) -9 (b) 0 (c) 14 (d) 25
Please show work thanks
Click here to see answer by Alan3354(30959)

Question 174665: 4.) If sin(2theta + 18) = cos(5theta - 12), which of the follwoing pairs of angles are represented in this equation?
(a)42, 48 degrees
(b)38, 52 degrees
(c) 12, 68 degrees
(d) 45, 45 degrees
thanks show work !
Click here to see answer by stanbon(57219)

Question 174693: 14) If cos y = -4/5 when 90degrees < y < 180degrees, find the value of sin(2y).
show work thanks

happy new years =)
Click here to see answer by jim_thompson5910(28476)

Question 174713: (11) Cody and Efrim were competing in a road rally. If Cody traveled
x^2 - 4 / 3x - 6 in the first hour and Efrim traveled 2x^2 + 3x - 2 / 8x - 4
who traveled farther the first hour of the race? Explain your reasoning.
Thank you please show work. Happy New Year !
Click here to see answer by Alan3354(30959)

Question 174716: 17.
Express the roots of 9x^2 + 40 = 36x in simplest (a + bi) form.
Thanks happy new years
Click here to see answer by Mathtut(3670)

Question 174716: 17.
Express the roots of 9x^2 + 40 = 36x in simplest (a + bi) form.
Thanks happy new years
Click here to see answer by jim_thompson5910(28476)

Question 174714: (12) Gabe's rabbit has a triangular hutch with two sides measuring 20 inches and 32 inches respectively. If the angle between these two sides of the hutch measures 104.2, what is the area of the rabbit's cage to the nearest square inch?
Click here to see answer by Alan3354(30959)

Question 174715: (15) Melba is building a grandfather clock and needs to know the minimum width of the case. If the pendulum;s arc subtends a central angle of 1.2 radians and the lenght of the pendulum itself is 18 inches, what is the minimum width of the clock case, to the nearest tenth of an inch, needed?
Please show work, Happy New Years!. Thanks
Click here to see answer by Alan3354(30959)

Question 174695: The following table provides the average cost per No-fault Clain in NYS.
Year Average Cost
1990 $3,360
1991 $3,788
1992 $4,197
1993 $4,396
1994 $4,623
1995 $4,862
1996 $4,969
1997 $5,675
1998 $6,064
1999 $6,700
Part...
(a) Determine the linear and exponential functions that best fit this data. (Remember to let t=0 represent 1990.)
(b)Which function do you think is most accurate? Which would you prefer to be most accurate? Explain your reasoning.
Can someone please help and show work =D thanks you so much!
Happy New Years !!!!!!!!!!!!
Click here to see answer by stanbon(57219)

Question 174858: i am very confused in working with the law of sines.
i need help finding the measurements of sides b, and c, and angle i already have the given information.

and i already know that your help would be appreciated.
Click here to see answer by nerdybill(6948)

Question 174891: 1+sin A/cos A + cos A/1+sin A = 2sec

Click here to see answer by piyushkumar47(2)

Question 174951: If x is a positive acute angle and cos x =√(3)/4, what is the exact value of sin x?
Click here to see answer by Alan3354(30959)

Question 174978: If the tangent of an angle is negative and its cosine negative is positive, in which quadrant does the angle terminate?
Click here to see answer by stanbon(57219)

Question 174977: What is the solution set of the equation |x^2-2x| = 3x-6
Click here to see answer by stanbon(57219)

Question 175045: Please help me on my homework. please correct my solutions and answers because i'm not sure if these are right answers.
1. 2 cars leave the same place at the same time. each car travels at a speed of 60 kph. one travels in the direction 60 degrees east of north. the other travels in the direction 45 degrees east of south. how far apart are the two cars after 30 minutes?
My solution:
d= distance of two cars after 30 min

sin60=x/60kph sin45=y/60
x=51kph y=42.43kph

d=51.96kph+42.43kph
d=94.39kph
d=94.39 km/1hr x 1 hr/60 min x 30 min
my answer : d= 47.20 km
2. 2 ships leave a big port at the same time. the first ship travels N 30 degrees W at 20 kph. the other heads toward N 15 degrees E at 25 kph. how far apart will they be in 3 hours?
sin30=x/20 kph sin15=y/25
x=10 y=6.47
10 kph + 6.47 kph = 16.47 kph
16.47 km/1 hr x 3 hrs = 49.41 km
3. A regular pentagon is inscribed in a circle whose radius is 18 cm. find the perimeter of the pentagon.
I really don't know how to solve it.

Click here to see answer by josmiceli(9649)

Question 175200: please help me on my homework. i really need your help
1. the resultant of two forces is 70 newtons. find the angles between the forces, if the magnitude of the two forces are 40 and 50 newtons.
2. two forces of 60 lbs and 40 lbs have an included angle of 50 degrees. find the magnitude and the direction of the resultant.
Click here to see answer by Alan3354(30959)

Question 175425: find the center and radius of y^2+x^2+9y-6x-10=0
Click here to see answer by Mathtut(3670)

Question 175425: find the center and radius of y^2+x^2+9y-6x-10=0
Click here to see answer by stanbon(57219)

Question 175424: find the center and radius of y^2+x^2+9y-6x-10=0
Click here to see answer by Mathtut(3670)

Question 175394: explain the relationship between the cosine function and its derivative?
Click here to see answer by josmiceli(9649)

Question 172642: Hi!
I have (cos(4X))^2 + (sqrt(3)/2) * sin(4X) = 0
Anyone out there that can help me?
Click here to see answer by eggsarecool(46)

Question 175639: how would i find the CSC of 135 degess, i know the formula is 1/y. which would end up beinga fraction, 1 over the square root of 2 over 2
how do i simplify that? please help!?
Click here to see answer by jim_thompson5910(28476)

Question 175824: 11.Complete the identity: sec-1/sec
Click here to see answer by jim_thompson5910(28476)

Question 175830: 12.Complete the identity: (sec*sin/tan)-1
Click here to see answer by jim_thompson5910(28476)

Question 175301: (12)
Gabe's rabbit has a triangular hutch with two sides measuring 20 inches and 32 inches respectively. If the angle between these two sides of the hutch measures 104.2, what is the area of the rabbits cage to the nearest square inch?
I know the answer is 42 inches, can someone show me how to get 42 inches?
Thanks so much

Click here to see answer by Alan3354(30959)

Question 175731: Square root of (5cos(theta)+12sin)theta)squared+(12cos(theta)-5sin(theta))squared=13
Click here to see answer by Alan3354(30959)

Question 176211: The angle of elevation e from A to B and the angle of depression d from B to A. Find the measure of each angle.
e: (7x-5) degrees, d: 4(x+7) degrees

I thought you had to equal them to each other then plug in x but the answer i get is 28 and i think i am way off from the correct answer please help me
Click here to see answer by stanbon(57219)

Question 176514: Please help me with this equation. I have to use Trig. Identities to solve it and i can't seem to find how to subtract the two fractions. Could you show me how to get there?
Click here to see answer by stanbon(57219)

Question 176506: Please help me with this equation. I have to use Trig. Identities to solve it and i can't seem to get both sides to equal the same thing. Could you show me how to get there?
Click here to see answer by ptaylor(2048)

Question 176512: Please help me with this equation. I have to use Trig. Identities to solve it and i can't seem to get both sides to equal the same thing. Could you show me how to get there?
Click here to see answer by Edwin McCravy(8880)

Question 177266: A forester, 180 feet from the base of a redwood tree, observes that the angle between the ground and the top of the tree is 30°. Estimate the height of the tree to the nearest tenth of a foot.
Click here to see answer by jim_thompson5910(28476)

Question 177267: Stonehenge in Salisbury Plains, England, was constructed using solid stone blocks weighing over 96000 pounds each. Lifting a single stone required 550 people, who pulled the stone up a ramp inclined at an angle of 9°. To the nearest tenth, approximate the distance that a stone was moved along the ramp in order to raise it to a height of 31 feet.
Click here to see answer by Earlsdon(6287)

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