Which expression is equivalent to 4^-5?

a. (4)(4)(4)(4)(4)
b. 1/(4)(4)(4)(4)(4)
c. (-)
d. -1/(4)(4)(4)(4)(4)

Solve the equation 3x2 + 19x + 9 = 0 to the nearest tenth.

The triangles are similar. what is the value of x? show your work.

The weights of players in a basketball league are distributed normally. the distance (d) of each player's weight (w) from the mean of 86 kilograms was computed as follows: d = |w - 86| if d is greater than 7 for approximately 5% of the players, what is the approximate standard deviation of the players' weights? a. 1.75 kilograms b. 3.5 kilograms c. 4.3 kilograms d. 7 kilograms