F(x)=x^2-2x-1  and   g(x)=5x-1/7x-3 find f(x+7) and g(x/2)

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

Idon’t understand! use slope intercept form to solve: through: (2,5) slope= undefined

The nth term of a sequence in 2n-1 the nth term of a different sequence is 3n+1 work out 3 numbers that are in bothe sequences and are between 20 and 40