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Marysya12 [62]
2 years ago
10

I need help! Math isn’t my best subject

Mathematics
2 answers:
Dmitriy789 [7]2 years ago
6 0

Answer:

A and c

Step-by-step explanation:

multiply the 3 to both parts of equation

balu736 [363]2 years ago
3 0

Answer:

it's A and C, multiply 3 with 3x and 4y

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If a 12-student class averaged 90 on a test, and a 20-student class averaged 80 on the test, then all 32 students averaged
Alexxx [7]
Let the marks of the students in class 1 be

m_1, m_2, ....., m_1_2

the average of these 12 marks is 90, so 

\frac{m_1+ m_2+ .....+ m_1_2}{12}=90

which means

m_1+ m_2+ .....+ m_1_2=90*12=1080


similarly, let n_1, n_2, ....., n_2_0 be the marks of the students in the second class, 

so \frac{n_1+ n_2+ ..... n_2_0}{20}=80

which means n_1+ n_2+ ..... n_2_0=80*20=1600


The 32 students averaged:

\frac{(m_1+ m_2+ .....+ m_1_2)+(n_1+ n_2+ ..... n_2_0)}{12+20}= \frac{1080+1600}{32}= \frac{2680}{32}=   83.75
5 0
3 years ago
Read 2 more answers
Please help quickly! will give brainliest! no explanation is required. just a correct answer :)
myrzilka [38]

Answer:

A

Step-by-step explanation:

8 0
2 years ago
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Graph the circle (x-8)^2 + (y+5)^2 = 4
Kobotan [32]

Answer:

The answer to your question is See the attachment

Step-by-step explanation:

Equation

             (x - 8)² + (y + 5)² = 4

Process

1.- Write the standard equation of the circle

            (x - h)² + (y - k)² = r²

2.- Find the center

The center are the letters h and k

      h = 8  k = -5

3.- Find the radius

      r = 2

4.- Graph the circle ( i will use geogebra)

See below

3 0
3 years ago
The area enclosed by one shooting circle is 401.92 square yards. Write and solve a formula to find the radius of the shooting ci
Daniel [21]

The formula for area in terms of radius is

... A = πr²

Solving this for r, we get

... A/π = r²

... r = √(A/π) . . . . . formula for the radius

For your given area, the radius is approximately

... r = √(401.92/3.14) = √128 = 8√2

... r ≈ 11.3 . . . yards

7 0
3 years ago
What is the answer to this problem 90-40.74
Rashid [163]
49.26 because 90-40.74=49.26
5 0
3 years ago
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