MaxWong

sin(size of angle) = opposite / hypotenuse

Therefore opposite = hypotenuse x sin(size of angle)

cos(size of angle) = adjacent / hypotenuse

Therefore adjacent = hypotenuse x cos(size of angle)

7.9*10^10

√144 = 12

Percentage of Fresh water = 100%-6.1% = 93.9%

3.4*10^6*93.9%

= 3192600

There are 3192600 gallons of fresh water

Let x ft be the distance a person travels on the escalator stairs.

sin35 = 84/x

x = 84/sin35 ≈ 146.45 

A person travels 146.45ft on the escalator stairs.

1.65x+120*200 = 1.65x+24000

0.06y+200=0.03y+350

6y+20000=3y+35000

3y=15000

y=5000

$\frac{(-2mn^2)^3}{4m^{-6}n^4}$

$= \frac{-8m^3n^6(m^6)}{4n^4}$

$= -2m^9n^2$

There are 12 sides in a cube

5 cube = 12 sides x 5 with each 5cm each side.

therefore perimeter

= 12 x 5 x 5

= 300 cm

(= 3 meters)

$2.5d+9.25=3+3.75d$

$1.25d=6.25$

$d=5$