The table shows the number of different types of roller coasters in the united states. an amusement park wants to build a new roller coaster. they will only build a roller coaster if there are less r< 10, where r is the number of a certain type of roller coaster, to determine which type(s) can be built.

Stand up and Suspended.

Step-by-step explanation:

We have been given a table that shows the number of different types of roller coasters in the United States. An amusement park wants to build a new roller coaster. They will only build a roller coaster if there are less than r<10, where r is the number of a certain type of roller coaster, to determine which type(s) can be built.

As company will build only those roller coasters whose number is less than 10.

We can see from our table that number of stand up roller coasters is 8 and number of suspended roller coasters is 5.

Since both 8 and 5 are less than 10, therefore, company will built stand up and suspended roller coasters.

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.

that is the sum

step-by-step explanation:

there are no other answers without knowing the variables values