Hallar el volumen de un paralelepípedo cuyas áreas de sus caras miden 30, 35 y 42 cm2 respectivamente, ayuda gente

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41

Atourist boat is used for sightseeing in a nearby river. the boat travels 2.4 miles downstream and in the same amount of time, it travels 1.8 miles upstream. if the boat travels at an average speed of 21 miles per hour in the still water, find the current of the river.

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 0.45, a standard deviation of 0.001, and margin of error of 0.5% a)0.44 b)0.46 c)0.45