Answer:
- Heather's model represents the greater area.
greater.
Step-by-step explanation:
The formula for calculate the area of a rectangle is:
Where "l" is the lenght of the rectangle and "w" is the width.
The formula for calculate the area of a square is:
Where "s" is the side lenght.
In this case, knowing that Elle's model represented 20 feet by 15 feet, we can say that:
Therefore, substituting these values into the formula , we get that the area is:
Since Heather's model represented 18 ft by 18 feet, we can identify that:
Substituting this value into , we get this area:
Notice that Heather's model represents the greater area.
To calculate how much greater it is, subtract the areas. Then:
Answer:
Georgina should add 3 liters of 49% citric acid solution.
Step-by-step explanation:
let x be the liters of 49% solution that Georgina should add. Then after she has added 0.5 liters of water, the total liters of solution she has will be
and 42% of this should be the solute:
and since adding water does not add any solvent, this amount must come from the 49% citric acid solution; therefore
Solving for 
we get:
This the amount of 49% citric acid solution Georgina must add.
So the pay after the increase is 4380 so subtract 4380-584 which equals 3796.
Answer:
-6 ?
Step-by-step explanation:
90+50=140
180-140=40
x=-6
48. A square's sides are equal, so we know that its area is a number multiplied by itself, or squared. To find the length of one side, you must take the square root of its area, 156.25, which is 12.5. To find the square's perimeter (how much fence we need to go around the garden) you must multiply that side by 4, to get 50. Antonine has 40 ft already, so he only needs 10 more ft, and each ft costs 4.97. Our final answer is 10*4.97, or $49.70.
49. The square root of 12 is about 3.46, plus 2 is our answer, about 5.46 cm.
