3. the cost of an iphone x is $1,149.00. the cost of an iphone 4 is $199.00. how many times greater is the cost of an iphone x than an iphone 4? round your answer to the nearest tenth.

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Points j and k plotted on the coordinate grid are two vertices of rectangle jklm rectangle jklm has an area of 7 square units point j is located at 2,1 and point k is located at -5,1 each vertex of the rectangle is located at a point that has integer coordinates. what is the perimeter of rectangle jklm? (need answer asap)

According to a survey by the beach lifeguards, there is a 25% chance that surfers will see a dolphin while surfing. which simulation could you use to answer questions about whether a surfer will see a dolphin?