Homework Help: Math - Trigonometry

Posted by Anonymous on Tuesday, July 17, 2012 at 11:10pm.

Find the value of x on this right triangle when a=20 b=5x-10 and c=2x(Square root of 5)
A. x = 15
B. x = 10
C. x = 12
D. x = 16

A wheel 5.00 ft in diameter rolls up a 15.0° incline. How far above the base of the incline is the top of
the wheel after the wheel has completed one revolution?
A. 13.1 ft
B. 8.13 ft
C. 9.07 ft
D. 4.07 ft

Solar panels are used to convert energy from the sun into electricity. To get the best result, the panel
has to be perpendicular to the sun's rays; in other words, angle è has to be a right angle. What should the height, h, be if è is a right angle, a solar panel is 12 ft long, and the sun's angle of elevation is 38°?

A. 9.4 ft
B. 9.5 ft
C. 15.4 ft
D. 7.4 ft

Which of the following pairs of angles are coterminal?
A. 100° and 620°
B. 25° and –25°
C. 390° and 750°
D. 30° and 60°

Math - Trigonometry - Henry, Wednesday, July 18, 2012 at 9:43pm
a^2 + b^2 = c^2.
(20)^2 + (5x-10)^2 = (2x*sqrt5)^2
400 + 25x^2 - 100x + 100 = 20x^2
25x^2 - 100x + 500 = 20x^2
Divide both sides by 5:
5x^2 - 20x + 100 = 4x^2
5x^2 - 4x^2 - 20x + 100 = 0.
x^2 - 20x +100 = 0
(x-10)(x-10) = 0.

x - 10 = 0
X = 10.
Math - Trigonometry - Henry, Wednesday, July 18, 2012 at 10:18pm
2. We form a rt triangle:
X = Hor side.
Y = Ver side or dist. from base.
Z = Hyp. = pi*D = 3.14*5 = 15.7 Ft.

Y = Z*sin15 = 15.7*sin15 = 4.07 Ft.

4. 390 Deg.
750 - 360 = 390 Deg.
Answer: C.

Answer this Question

Related Questions

Math - What are the solution sets of the following 3 problems,the square root of...
Geometry Help - The length of a rectangle is 2 cm more that 5 times it's ...
Math - Trigonometry - Find the value of x on this right triangle when a=20 b=5x-...
ALGEBRA - 1, Factor each expression x^2 - 10x - 24 A. (x + 4)(x - 6) B. (x + 6)(...
Algebra - Hello Reiny, please check these problems for me and if they are not ...
Trigonometry - Find the value of x on this right triangle when a=20 b=5x-10 and ...
Algebra - Rationalize each expression by building perfect nth root factors for ...
Trig functions and such - 1)Find the exact value of cot(-315) A)1 B)square root ...
math: polynomials - Please help me with these three problems! 1. solve for x: 3x...
MTH 157 - I need help on these two questions. 1. Describe what happens to the ...

For Further Reading

First Name:
School Subject:
Answer: