Geno and I didn't make any errors (that I know of)......we just interpreted this differently......the poster can see which matches his question.....
Yes, Melody, that is the easiest.....we could also find it by the Method of Co-Factor Expansion, but that's more difficult.....!!!
Notice ....
20 * sin40 =
20 * 0.642787609687 =
12.855
Does that make sense ??? (make sure your calculator is set to degree mode....)
3√54 = 3√(9*6) = 3√9√6 = 3*3√6 = 9√6
7+8+8-7-10 =
15 + 1 - 10 =
16 - 10 =
6
Mmmm....it doesn't seem that tricky !!!
5x^4+3x^3+1x^2+2
Here's the graph........https://www.desmos.com/calculator/3b00rkcems
Notice that this polynomial never intersects the x axis......thus there are no real zeros....!!!
I'm assuming this is
20=-15(cos22.5)t+17 subtract 17 from both sides
3 = -15(cos22.5)t divide both sides by -15(cos22.5)
3 / (-15cos22.5) = t = about -0.2165
Let's see...using the Law of Sines, we have
b/sin40 = c/sin90 (sin90 = 1)
b/sin40 = 20
b =20sin40 = 12.855
Melody and I both cheated...(but she cheated first.....and as chief mod, she should set a BETTER EXAMPLE to the people of Camelot!!!)...LOL!!!!
Note the graph.......https://www.desmos.com/calculator/dbrn6oivcb
These are two triangles which have a base = 8 and a height = 3
So, the area is just 2(1/2)(8)(3) = 24 units
