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Misha Larkins [42]
3 years ago
11

Find the valueof(3x + 3y)^2If xy = =-2 and x^2+y^2=5​

Mathematics
1 answer:
Ira Lisetskai [31]3 years ago
4 0

Step-by-step explanation:

9x^2 + 9y^2 + 18xy

9(5)+18(-2)

45-36

9

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Two ways to write a algebraic expression of n-5
deff fn [24]
-5 + n is another way to write the expression. 
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Pls help I hate math rectangular prism
nekit [7.7K]

Answer:

352.5cm^{2}

Step-by-step explanation:

A=3Rectangles+2Triangles\\=3*7.5*13.5+2*.5*6.5*7.5=352.5cm^{2}

8 0
2 years ago
In triangle ABC, and C is a right angle. Find the value of the trig function find the sec(A) if C=25, B=20, A=15
asambeis [7]

Answer:

sec A = 5/4

Step-by-step explanation:

Sec of an angle is hypotenuse/adjacent side

In your problem, sec A = 25/20 = 5/4

It helps if you can draw a figure of the problem.  Make sure you memorize the definition of each trig function

5 0
3 years ago
Which is the graph of the function f(x)= negative square root x
Vsevolod [243]
First, note that \sqrt{x} is always positive (except for x=0), so -\sqrt{x} must be always negative.

Thus, the only plausible graphs are 1 and 3 since they are below the x-axis.

Now, \sqrt{x} and -\sqrt{x} are only defined for x≥0, because only for these x'es we can take the square root. 

Note that the third graph has domain (-infinity, 0], so it is not the right one, while 1 is ok.


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6 0
3 years ago
Shianne is looking up at the flag on the top of the sailboat she is sailing on. She is sitting 16 feet from the bottom
storchak [24]

Answer:

height of the flag from the bottom of the boat ≈ 32 ft (nearest foot)

Step-by-step explanation:

She is on her boat and the angle of elevation to the top of the flag is 58°. Her eyes her 6 ft above the bottom of the boat she is sailing on. The height of the flag from the bottom of the boat is the sum of the height of the flag and the remaining height from the horizontal line of sight upward to the flag top.

A right angle triangle was formed Shianne line of sight. The angle from her line of sight is 58° from the horizontal. Therefore,

the adjacent side of the triangle formed is 16 ft which is the distance from the boat to the flag.

adjacent side = 16 ft

opposite angle = ?

using tangential ratio

tan 58° = opposite/adjacent

tan 58° = h/16

cross multiply

h = 16 × 1.60033452904

h = 25.6053524647

height of the flag from the bottom of the boat = 25.6053524647  + 6 = 31.6053524647

height of the flag from the bottom of the boat ≈ 32 ft(nearest foot)

7 0
3 years ago
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