Oliver makes blueberry jam every year. The number of pints of jam he makes this year can be represented by the expression 4p-9 , where p is the number of pints of jam he made last year. Oliver made 8 pints of jam last year. How many pints does he make this year?

23

Step-by-step explanation:

no of pints he makes this year = 4p - 9

p is the no of pints made last year,

since he made 8 pints the previous year,

p= 8, no of pints = 4p - 9

= 4(8) - 9

= 32 - 9

= 23.

answer:   14

step-by-step explanation:          

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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.