Ten less than 2 times the value of a number is equal to 5 times the quantity of 4 more than one-fifth of the number. If a is the number, what is the value of a? Pls Help!!!

Eric has challenged himself to walk 24,000 steps in 4 days. if eric walks the same number of steps each day, which function represents the number of steps eric still needs to walk to reach his goal with respect to the number of days since he started his challenge? a. y = 8,000x − 24,000 b. y = -8,000x + 24,000 c. y = 6,000x − 24,000 d. y = -6,000x + 24,000

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

I'm confused on this could anyone me and show me what i need to do to solve it.