X is less than or equal to 3

x≤3?

correct me if I'm wrong

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

Mikes car gets an average of 28 mpg. there are 12 gallons of fuel in mikes car when he starts his trip of 140 miles. about how many gallons are left at the end of his trip?

The power generated by an electrical circuit (in watts) as a function of its current c (in amperes) is modeled by p(c)= -15c(c-8) what current will produce the maximum power?