Answer: I think
Step-by-step explanation:
4 different salads, 7 different main courses, and 6 different desserts
1. Check the picture at the bottom.
2. ABCD is a right trapezoid so the diagonals have equal length. Lets find diagonal BD.
3. In triangle ABD we are given the length AB=7, AD=5 and m(A)=80°.
4. We use the cosine law: 
5. Cosine of 80 can be found with a scientific calculator or in the internet as cos80=0,17
6. 
square root of BD=7.88, so the answer is 8 feet.
That the answer for that question
Your answer for 21. x = 4/5, b 19. n = -2/3, a
first, distribute -6 to (2b + 1), giving you -12b - 6, and then on the another side of the equation, distribute -2 to (5 + 4b) giving you, -10 - 8b. now we need to put our coefficients on one side so we will add 8b to each side of the equation, giving us -6 = -10 - 8b + 12b, then we will add 10 to both sides of the equation giving us, 10 -6 = -8b +12b, this gives u 4 = 4b. then, you would solve for b, which equals 1.
