Find r(x)=f(x)g(x) where f(x)=12x+1208x+72 and g(x)=x2+18x+80x2+21x+108.

R(x) = 98820x³ + 53412x² + 134568x + 7776

Step-by-step explanation:

We are given the functions

f(x) = 12x + 1208x + 72

Simplifying the function

f(x) = 1220x + 72

g(x) = x² + 18x + 80x² + 21x + 108

g(x) = 81x² + 39x + 108

We have to find R(x) = f(x)g(x) = (1220x + 72) (81x² + 39x + 108)

= 1220x (81x² + 39x + 108) + 72 (81x² + 39x + 108)

= 98820x³ + 47580x² + 131760x + 5832x² + 2808x + 7776

R(x) = 98820x³ + 53412x² + 134568x + 7776

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m