Dragan

A square building with an area of 225 m2 has a garden surrounding it that has an equal width on all sides. The area of the garden is 1/3 of the area of the building. What is the width of the garden?

The width of the garden  W = { sqrt[ 225 + ( 225/3)] -15 } /2  

90° / 6 = 15° 

Complementary angles are:   15° and 75°

Suppose that you have an enormous grapefruit that is 92% water (by weight). The grapefruit weights 100 pounds. If the water content of the grapefruit evaporates until it is 90% water (by weight), then approximately how much does the grapefruit now weigh?

Sorry to say,but you're wrong!

You were correct in this:>   https://web2.0calc.com/questions/help-asap-thanks_2#r5

I'm gonna use the same calculations for this math problem.

[ 0.92 * 100 - 0.90 (100 - x)] = x      ( "x" represents the weight loss)

92 - ( 90 - 0.90x) = x

92 - 90 + 0.90x = x

2 + 0.90x = x

2 + 0.90x - 0.90x = x - 0.90x

2 = 0.1x

x = 20

New weight is    100 - x = 80  

Nice diagram 

The answer is on the next page. 

I think that your answer is not correct. Read the question carefully.

The correct answer is:   

   The ratio of the Blue area to the Yellow area to the Red area is:      1 : 1 : 2    

The area of a hexagon  ABCDEF = 39.84 u²

Which angles are coterminal with an angle measure of  2π/3 ?

  2π/3 - 2π = 2π/3 - 6π/3 = - 4π/3                  -4π/3 -2π = -4π/3 - 6π/3  = - 10π/3                 

  2π/3 + 2π = 2π/3 + 6π/3 = 8π/3            

Here's a link where you can learn the basic about coterminal positive and negative angles.

https://www.chino.k12.ca.us/site/handlers/filedownload.ashx?moduleinstanceid=5575&dataid=2608&FileName=NOTES%20COTERMINAL%20ANGLES.pdf

Rectangle diagonal:          D = sqrt [ (√25 - √7)/2 ]² + [√25 - (√25 - √7)/2 ]²           

180/2 - 38/2 = 71