Please help me to do this

sinx+cosx-sin(x-30)+cos(x-30)=√6c os(x-15)

Simplify. −4x^2 (5x^4−3x^2+x−2) −20x^6−12x^4+8x^3−8x^2 −20x^6+12x^4−4x^3+8x^2 −20x^8+12x^4−4x^2+8x −20x^6+12x^4+4x^3−8x^2

The functions below show the amount of money bella and sweet t had saved after earning money for doing chores. which description best compares the two functions?

You buy five cds at a sale for $5.95 each. write an expression for the total cost of the cds. then use the distributive property and mental math to evaluate the expression.