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1) For what values is the statement true? sin(x+20)°=cos(y−10


x=20, y=60


x=20, y=50


x=30, y=40


x=30, y=60


2)In right triangle ABC with right angle C, sinA=4/5 and cosA=3/5. What is sinB+cosB?


1/5


7/5


35/12


5/7


3)In a right triangle ABC where sinA=cosB, what are the measures of acute angles A and B if the measure of angle A is three times the measure of angle B?


The measure of angle A is 67. 5° and the measure of angle B is 22. 5°.


The measure of angle B is 135° and the measure of angle A is 45°.


The measure of angle A is 135° and the measure of angle B is 45°.


The measure of angle B is 67. 5° and the measure of angle A is 22. 5°.


4)What is the value of b that makes the equation cos(17b+26)°=sin(15b)° true?


13


2


9. 5


3

Sagot :

Monkoekutlwanoidn

Answer:

1) X =20° ,Y=60°

2) 7/5

3) first is correct

4) 2

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