Please help with number 5 i don't know how to fill in the table ​

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

What are the measures of angles a, b, and c? show your work and explain your answers. 25 points

20 points for the answer. this is for real , don't put random ! a rectangle has a length of 4 centimeters and a width of 7 centimeters. what is the effect on the perimeter when the dimensions are multiplied by 5? the perimeter is increased by a factor of 5. the perimeter is increased by a factor of 20. the perimeter is increased by a factor of 25. the perimeter is increased by a factor of 100.