Write an expression to represent: three times the sum of 5 and a number, n Hana's car used 3/4 of a tank of gas to cross Arizona. The gas tank on her car holds 15 1/2 gallons. how many gallons of gas did it take to cross Arizona, what was her mpg?
also that

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 25002500 grams and a standard deviation of 800800 grams while babies born after a gestation period of 40 weeks have a mean weight of 27002700 grams and a standard deviation of 385385 grams. if a 3232-week gestation period baby weighs 21252125 grams and a 4040-week gestation period baby weighs 23252325 grams, find the corresponding z-scores. which baby weighs lessless relative to the gestation period?

The length of a rectangle plus its width is 24 cm. the area is 143 square cm. what are the length and width of the rectangle?