The ratio of the number of students in Mr. Johnson's class who brought lunch yesterday to the number of students who did not bring lunch was 4:7. Twelve students brough lunch. How many students were in Mr. Johnson's class yesterday

Need so much on this one how many yards?

Emily convinced her mom to buy a giant box of her favorite cereal. her mom doesn't think the box will fit on their shelf. the volume of the box is 1000 cm^3 . the base of the box is 25 cm by 10 cm

The maximum distance (in nautical miles) that a radio transmitter signal can be sent is represented by the expression 1.23h√, where h is the height (in feet) above the transmitter. estimate the maximum distance x (in nautical miles) between the plane that is receiving the signal and the transmitter. round your answer to the nearest tenth.