4. There are 71 squirrels in a tree. 52 are helpful squirrels, 25 are devious squirrels, and 15 are neither helpful nor devious. a) Draw a Venn diagram for this situation. (3 marks, com)

Aresearch company wants to test the claim that a new multivitamin to improve short term memory. state the objective of the experiment, suggest a population, determine the experimental and control groups, and describe a sample procedure.

Solve 3x-18=2y and 5x-6y=6 by elimination show work

In each of the cases that follow, the magnitude of a vector is given along with the counterclockwise angle it makes with the +x axis. use trigonometry to find the x and y components of the vector. also, sketch each vector approximately to scale to see if your calculated answers seem reasonable. (a) 50.0 n at 60.0°, (b) 75 m/ s at 5π/ 6 rad, (c) 254 lb at 325°, (d) 69 km at 1.1π rad.