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Anit [1.1K]
3 years ago
8

Someone help me with all these questions

Mathematics
1 answer:
Illusion [34]3 years ago
3 0
28. 220 yards is 660 feet and you have to multiply by 12 so you get 7920.

29. 100 feet is 1200.

30. You have to multiply by 12 to get feet and multiply by 3 to get yards and then you get 1728.

31. You have to multiply by 10 so you get 216.
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What is the solution to this system of linear equations?2x + y = 13x – y = –6(–1, 3)(1, –1)(2, 3)(5, 0)
worty [1.4K]

\underline{+\left\{\begin{array}{ccc}2x+y=1\\3x-y=-6\end{array}\right}\ \ \ \ |\text{add both sides of equations}\\.\ \ \ \ \ 5x=-5\ \ \ \ |:5\\.\ \ \ \ \ \ x=-1\\\\\text{put the value of x to the first equation}\\\\2(-1)+y=1\\-2+y=1\ \ \ |+2\\y=3\\\\\text{Answer:}\ (-1,\ 3)

5 0
3 years ago
4y and 5xy are like terms or are unlike terms
Norma-Jean [14]

Answer:

Unlike terms

Step-by-step explanation:

If it was 4y and 5y it would be like. Adding the x though makes them unlike terms, you cannot combine them

4 0
3 years ago
What is the area of the polygon
Evgen [1.6K]
. Perimeter of regular polygons, however, is a required topic. Area (regular polygon) Regular polygons have all sides of equal length. a = apothem p = perimeter
5 0
3 years ago
A plaine's altitude changes by -1,000 feet. Is the plane going up or down?
SOVA2 [1]
The plane is going down.
8 0
3 years ago
What is the percent increase in the surface area of the AAA battery to the AA battery? Round your answer to the nearest tenth of
Bogdan [553]

Answer:

101.1%

Step-by-step explanation:

The two batteries are in the shape of cylinder.

The total surface area of a cylinder

SA = (2πr^2 + 2πrh ) =

For AAA battery

h = 0.8mm

r = 1.9 mm

SA = (2π(1.9)^2 + 2π × 1.9 × 0.8 )

SA = 22.68 + 9.55

SA = 32.23 mm^2

For AA battery

h = 1 mm

r = 2.75 mm

SA = (2π(2.75)^2 + 2π×2.75× 1 )

SA = 47.52 + 17.28

SA = 64.80 mm^2

Increase in SA = 64.80 - 32.23

Increase in SA = 32.57

% increase = increase in SA/AAA × 100

% increase in SA = 32.57/32.23 × 100

% increase in SA = 101.1%

4 0
3 years ago
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