ElectricPavlov

two hundredths       2/100      .02 

Easy to set this up as a RATIO

$10.38/666batteries =  x/888batteries

10.38/666  *  888 = $13.84

sec = 1/cos   = 5/4

1/(5/4) = cos = 4/5

cos^2 + sin^2 = 1   (Remember that?)

(4/5)^2 + sin^2 = 1

1-(4/5)^2 = sin^2

9/25 = sin^2

sin = 3/5

Her TIME for the entire journey is given by   Distance/Rate = Time

45km/(75 km/hr) = .6 hr = 36 minutes

She spent 21 minutes going the first 2/3    2/3 of 45 = 30 km

SO she spent  36min-21min = 15 minutes travelling the remaining 15 km

Rate = distance/time = 15km/15min=15km/.25hr= 60km/hr for the final 1/3 (15 km)

The 'power of 2' first.....

This equation is incorrect !

3f-12=3(f-12)

3f-12=3f-36       Subtract 3f from both sides

-12 = -36            Cannot be true !

a^2 + b^2 = c^2      where a is a side and b is a side and c is the hypotenuse (Pythagorean Theorem)

Add '2y' to both sides and you will get:

5x+6x = 11x

11x=11x             so any number for 'x' will be true

.8 x 32.76 = = ?    Use calcualtor

180 degrees = pi radians