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Dmitriy789 [7]
3 years ago
12

Select the correct answer.

Mathematics
2 answers:
Nitella [24]3 years ago
7 0

Answer:

D. The mean number of hours will increase.

Step-by-step explanation:

bagirrra123 [75]3 years ago
4 0

Answer: it is B

Step-by-step explanation:

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Find the center, vertices, and foci for the ellipse 25x^2 + 64y^2 = 1600
Alisiya [41]

Answer:

The answer to your question is below

Step-by-step explanation:

Data

Equation               25x² + 64y² = 1600

Process

1.- Divide all the equation by 1600

                             25x²/1600 + 64y²/ 1600 = 1600/1600

-Simplify

                              x²/64 + y²/ 25 = 1

2.- Equation of a horizontal ellipse

                             \frac{x^{2} }{a^{2}} + \frac{y^{2}}{b^{2}} = 1

3.- Find a, b and c

    a² = 64             a = 8

    b² = 25             b = 5

-Calculate c with the Pythagorean theorem

                   a² = b² + c²

-Solve for c

                   c² = a² - b²

-Substitution

                   c² = 8² - 5²

-Simplification

                  c² = 64 - 25

                  c² = 39

-Result

                  c = √13

4.- Find the center

          C = (0, 0)

5.- Find the vertices

          V1 = (-8, 0)     V2 = (8, 0)

6.- Find the foci

          F1 = (-√13, 0)   F2 = (√13, 0)

7 0
3 years ago
What’s the simplified form of 2x+3-x+5
Natalija [7]
2x+3-x+5
x+8 is the simplified answer.

Hope this helps!! 
5 0
3 years ago
Read 2 more answers
13 please I have no idea what the steps for this is
Ilya [14]

Answer:

UV=142

Step-by-step explanation:

21x-13=10x+31

+13 +13

21x=10x+44

-10x=-10x

11x=44

÷11 ÷11

x=4

now substitute 4 in place of x (only have to solve one)

21(4)-13= 71

now multiply your answer by 2

71×2=142

6 0
3 years ago
Help me with this please
m_a_m_a [10]
36 is the value
answer
4 0
2 years ago
Which ordered pair is a solution of the equation y=x-4
Andreyy89
The answer would be y=-4 and x=4, so pick which ever number/letter has this answer.
5 0
3 years ago
Read 2 more answers
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