Jonathan spins the spinner 10 times. what is the theoretical probability that it stops on the black sector on the last spin?

1 over 40
1 over 4
5 over 2
41 over 4

Y=4x^2+x-1 solve using quadratic formula

Which of the binomials below is a factor of this exression? 16x^2+40xy+25y^2 a.4x-5y b. 2x-5y c.4x+5y d.2x+5y

Janet is rolling a number cube with the numbers one through six she record the numbers after each row if she rolls of keep 48 times how many times should she expect to roll a 4