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Beckoning

Anyone good at math?

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Well i'm in a few online math classes.. and what can i say.. i'm a language man myself. I'm having a lot of trouble with them (they are trig/pre calc) and if anyone doesn't mind helping me with a few *hundred* problems i'd love you forever.

The only resource the class gives me is a piece of shit book which literally would be more useful cleaning up after i drop a deuce. It's a joke..

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Let me know what it is and i will look into it. PM me the info.

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I'll just post a few here. Mind you these are just a few, i have tons more that i have no idea what i'm doing with. Math is not my forte..

 

 

 

Find the coordinates, to the nearest hundreth, of the vertices of triangle PQR with P(0,1), Q(0,-4), and R(2,5) after a 45° rotation about the origin.

Question 9 answers

a P(0.71, 0.71), Q(2.83, -2.83), R(2.12, -4.95)

b P(-0.71, -0.71), Q(-2.83, -2.83), R(-2.12, 4.95)

c P(-0.71, 0.71), Q(2.83, -2.83), R(-2.12, 4.95)

d P(0.71, -0.71), Q(-2.83, 2.83), R(2.12, -4.95)

 

 

 

Find the value if sin A=12/13 with 90° ≤ A ≤ 180° and if sin B = -7/25 with -90° ≤ B ≤ 0°.

 

cos(A-B)

 

 

 

Two pilots take off from the same airport. Mason heads due south. Nancy heads 23° west of south. After 400 land miles, how far is Nancy from Mason's route?

 

 

 

Find the value if sin A=12/13 with 90° ≤ A ≤ 180° and if sin B = -7/25 with -90° ≤ B ≤ 0°.

 

sin(A+B)

 

Find the value if sin A=12/13 with 90° ≤ A ≤ 180° and if sin B = -7/25 with -90° ≤ B ≤ 0°.

 

tan(A+B)

 

Find the coordinates, to the nearest hundreth, of the vertices of triangle FGH with F(0,10) G(10,0) and H(1, -1) after a 75° rotation about the origin.

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ROFL, i took AP Calculus and tbh i've got not a single clue on where to start.. Maybe its the summer :/

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Man this is really some old stuff.. It's been like 10 years+ i have seen this things..

 

 

Find the value if sin A=12/13 with 90° ≤ A ≤ 180° and if sin B = -7/25 with -90° ≤ B ≤ 0°.

 

cos(A-B)

 

cos(A - B) = cosAcosB + sinAsinB

 

Find the value if sin A=12/13 with 90° ≤ A ≤ 180° and if sin B = -7/25 with -90° ≤ B ≤ 0°.

 

sin(A+B)

sin(A + B) = sinAcosB + cosAsinB

Find the value if sin A=12/13 with 90° ≤ A ≤ 180° and if sin B = -7/25 with -90° ≤ B ≤ 0°.

 

tan(A+B)

tan(A+B) = [tan(A)+tan(B)]/[1-tan(A)tan(B)],

 

 

I will try to remember some geometry when I get time and try to solve it.

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Here is some more trig

 

3. Use the formula for the area of a circle, A = p r ² , and derive the formula for the area of a sector using only the variables r and ? . Assume that ? is in radians.

 

4. In the diagram below, find the area of the shaded sector. The circles are tangent to one another as shown in the diagram.

 

 

WP2_clip_image001.jpg

 

 

 

 

 

 

 

 

02d.jpg

 

Evaluate each of the following.

 

5. sin(Cos^1 4/5)

 

6. cos(Tan^-1 12/13)+

 

7. tan(Sin^-1 5/13)

 

8. cos(Sin^-1 12/13)

 

9. sec(Tan^-1 7/24)

 

10. csc(Sin^-1 9/41)

 

11. cos(Sin^-1 x) where -1 ≤ x ≤ 1. (Hint: Think of x as a ratio and use the Pythagorean Theorem.)

 

12. csc(Tan^1 1/x) where x> 0. (Hint: Draw a triangle and use the Pythagorean Theorem.)

 

Gabe is spending two weeks on an archaeological dig. He finds a fragment of a circular plate that his leader thinks may be valuable. The arc length of the fragment is about 1/6 the circumference of the original complete plate and measures 1.65 inches.

 

A similar plate found earlier has a diameter of 3.14 inches. Could Gabe's fragment match this plate?

 

13. Write an expression for the radius, r , of the earlier plate.

 

14. What is the measure, in radians, of a central angle, ? , that intercepts an arc that is 1/6 the length of the circumference of a circle?

 

15. Write an expression for the arc length, S , intercepted by this central angle.

 

16. How long would the arc length of a fragment be if it were 1/6 the circumference of the plate?

 

17. Could Gabe's plate be a matching plate? Explain

 

18. Toby finds another fragment of arc length 2.48 inches. What fraction of the outer edge of Gabe's plate would it be if this fragment were part of Gabe's plate?

 

The diameter of a merry-go-round at the playground is 12 feet. Elijah stands on the edge and his sister pushes him around.

 

19. How far does Elijah travel if he moves through an angle of 5p/4 radians?

 

20. Through what angle does Elijah move if he travels a distance of 80 feet around

 

the circumference?

 

Virgil sets his boat on a 1000-yard course keeping a constant distance from a rocky outcrop.

 

21. If Virgil keeps a distance of 200 yards, through what angle does he travel?

 

22. If Virgil keeps a distance of 500 yards, what fraction of the circumference of a circle does he cover?

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wow, i thought bio-chem was hard... ha i am so glad im not taking math till next semester

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This is all trig stuff, if you guys were in calc then the pre calc would be much easier for you, i could post some of that.

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Find the coordinates, to the nearest hundreth, of the vertices of triangle PQR with P(0,1), Q(0,-4), and R(2,5) after a 45° rotation about the origin.

Question 9 answers

a P(0.71, 0.71), Q(2.83, -2.83), R(2.12, -4.95)

b P(-0.71, -0.71), Q(-2.83, -2.83), R(-2.12, 4.95)

c P(-0.71, 0.71), Q(2.83, -2.83), R(-2.12, 4.95)

d P(0.71, -0.71), Q(-2.83, 2.83), R(2.12, -4.95)

 

 

Doesn't it matter what direction the rotation is, or is there some sweet property of this weird PQR triangle that I'm unaware of?

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I think if it's a clockwise rotation because it's a positive number, i ended up getting that one right on my test by guessing :P

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