The polynomial 0.0012 x cubed minus 0.075 x squared plus 1.6 x plus 13 0.0012x3−0.075x2+1.6x+13 models natural gas consumption in trillions of cubic feet, where x equals =0 corresponds to 1960, x equals =1 to 1961, and so on. How much natural gas was consumed in 1990?

25.9 Trillions Cubic feet

Step-by-step explanation:

The polynomial that models consumption of natural gas is given as 0.0012x³-0.075x²+1.6x+13

x=0 (In 1960)

x=1 (In 1961)

Therefore in 1990, x=1990-1960=30

We substitute x=30 in the polynomial to determine gas consumption in 1990.

0.0012x³-0.075x²+1.6x+13

Consumption in 1990

=0.0012(30)³-0.075(30)²+1.6(30)+13

=(0.0012 X 27000) - (0.075 X 900) + 48 +13

=32.4-67.5+48+13

=25.9

Therefore, in 1990, 25.9 Trillions Cubic feet of gas was consumed.

step-by-step explanation:

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$16

$15

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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.