The answer would be: t= -5/4
Using equivalent angles, the solutions are given as follows:
a)
.
b)
.
c) 
<h3>What are equivalent angles?</h3>
Each angle on the second, third and fourth quadrants will have an equivalent on the first quadrant.
For item a, we have to find the equivalent angle on the 2nd quadrant, where the sine is also positive.
Hence:

Hence
.
For item b, if two angles are complementary, the sine of one is the cosine of the other.
Complementary angles add to 90º = 0.5pi, hence:



The equivalent angle on the second quadrant is:

Hence the solutions are:

For item c, the angles are also complementary, hence:



The tangent is also positive on the third quadrant, hence the equivalent angle is:

Hence the solutions are:

More can be learned about equivalent angles at brainly.com/question/28163477
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Answer:
A)12 square units
Answer: Hello, there! Your Answer is Below^^
7.O2 Would be The Correct Answer.
Step-by-step explanation:
So I Subtracted 20 - 12.98 And Got the Answer $ 7.02
To Add Or subtract Decimals Here's what you can do to find your Answer
Line up the numbers vertically so that the decimal points all lie on a vertical line.
Add extra zeros to the right of the number so that each number has the same number of digits to the right of the decimal place. Step 3: Subtract the numbers as you would whole numbers.
<em>Hope this Helps!!</em>
<em> Have a great day!!!</em>