Adeck of cards is shuffled and three cards are delt. find the chance the second card is spade and the third card is heart

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

Larry wants to buy some carpeting for his living room. the length of the room is 4 times the width and the total area of the room is 16 square meters. what is the length of the living room