Given cos0=4/5 and 0 degrees<0<90 degrees; find sin 20

50 points and will mark brainlest if you were constructing a triangular frame, and you had wood in the length of 4inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no? = explain your mathematical thinking:

What are the solutions for the following system? -2x^2+y=-5 y=-3x^2+5

There are a total of 75 students in the robotics club and science club. the science club has 9 more students than the robotics club. how many students are in the science club?