It costs a family $324 to buy a 10-ft-by-12-ft rug. at this rate, what will it cost them to buy a 15-ft-by-18-ft rug?

Area of the rug the family bought = 10 x 12 = 120 ft²

120 ft² cost $234, find the cost of 1 ft²

⇒ 120ft² = $324

⇒ 1ft² = $324 ÷ 120 = $2.70

Area of the new rug = 15 x 18 = 270 ft²

1 ft² = $2.70, find the cost of 270 ft²

⇒ 1 ft² = $2.70

⇒ 270 ft² = 270 x $2.70 = $729

The 15-ft by 18-ft rug will cost $729

just do 5.2 + 2 ( 7.2) and 1/3 x 3 (.9) and youv'e got your equation. 0.9( 9/10) + 7.2 ^2 = 16.4 hope i could !

step-by-step explanation:

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)