Between 1960 and 1990, the number of farms in the United States decreased by 2.1% per year. In 1960, there were 4 million farms. How many farms were there in 1990?​

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?

Solve this problem! extra ! 3025/5.5 = a/90.75

Select the correct answer from each drop-down menu. consider the following polynomials equations. 3x^2(x-1) and -3x^3+ 4x^2-2x+1 perform each operation and determine if the result is a polynomial. is the result of a + b a polynomial? yes or no is the result of a - b a polynomial? yes or no is the result of a · b a polynomial? yes or no