Martha types a 4−digit code into a keypad to unlock her car doors. The code uses the numbers 1 and 0. If the digits are selected at random, what is the probability of getting a code with exactly three 0's? Enter your answer as a simplified fraction.

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.

Using elimination, what is -4x+2y=-12 4x+8y=-24