There are two types of hot-water heaters: tank and inline. an experiment is to be conducted to determine whether the life of the hot-water heater is the same for both types of hot-water heaters. in previous studies, it was determined that family size (small, medium, large) is associated with life expectancy of the water heater, but house size (small, medium, large) is not associated with life expectancy of the water heater. how would blocking best be used?

468

step-by-step explanation:

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

hey! so 1 (25) out of 4 (100) is 25 so your answer is 25%. it's like quarters!

38.6°

step-by-step explanation:

resultant is 10 pound

smaller force = 8 pound

angle formed = tan⁻¹(

                        =tan⁻¹(

                          =tan⁻¹(0.8)

                        =38.6°