Degree :(1) Which trigonometric expression equivalent to cos(6x)° cos(3x)° +
sin(6x)° sin(3x)º

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years

Joe has some money in his bank account he deposits 45$ write an expression that represents the amount of money in joe's account