I am so confused with this and the law of sines. can somebody elaborate?

Chapter 6 Problems 1. Solve for the missing sides of the following triangles. A decimal answer is acceptable. Remember that these are Right Triangles. Per the book, lower case letters represent length, upper case letters represent angles. a. Side a =2, Side b =9, Side c =? b.a=0.07,b=0.05,c=? c.b=289,c=654,a="7 da=1/32,c=7/16,b="? ea=844m,c=915m,b="7? 2. See the sine, cosine and tangent relationships written for angle A in the standard triangle (see Figure 6.4). Write the relationships again, but for angle B. Example: sin B = opp/hyp = b/c 3. Use a calculator to solve the trigonometric functions (sine, cosine and tangent) of the following angles: R r: U - 4. Solve for the following unknown sides OR angles for the following right triangles: .a=6,c=10,A="? .a=023,c=190,B="7 .A=64,b=756,c=7 .B=41,c=40.6, b =7 .A=345B=7, 5. The percent grade of a slope is 48.4. If the thickness of the base is 43 ft., what is the height? (To solve, first draw a cross-sectional view). Look at the rise versus run example in the text