2 years ago

Pls I need it for a testI’ll give out 20 points

Mathematics

1 answer:

kompoz [17]2 years ago

6 0

Answer:

It should be D.

Step-by-step explanation:

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Montano1993 [528]

1/2 chance of getting an even number and 1/2 chance of getting an odd one.

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3 years ago

Read 2 more answers

Having trouble with subtracting and regrouping mixed numbers. 5 1/8 -2 4/8.

Mkey [24]

You will need to convert them into improper fractions, subtract them, and convert them back to mixed numbers.
5 1/8 - 2 4/8
41/8 - 20/8
21/8
2 5/8
Your answer is 2 5/8.

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3 years ago

Which of the following is a perfect square trinomial?

shutvik [7]

Answer:

Step-by-step explanation:

Take a look at what happens when squaring either of these...

$(ax-by)^2=(ax-by)(ax-by)=a^2x^2-2abxy+b^2y^2\\\\(ax+by)^2=(ax+by)(ax+by)=a^2x^2+2abxy+b^2y^2\\$

Notice a couple of patterns.

1. The last term has a positive coefficient. That rules out answer choices C and D.

2. The coefficient of the middle term is either $+2ab \text{ or } -2ab$ . So what are a and b? a is the square root of the x^2 term and b is the square root of the y^2 term.

$25x^2 \Rightarrow a=5\\\\9y^2 \Rightarrow b=3\\\\ab=15\\\\2ab=30$

The middle coefficient needs to be either +30 or -30. The answer is choice A.

5 0

2 years ago

Which is the best first step when solving the following system of equations? 5 c + 4 d = 10. 3 c + 2 d = 16. Multiply the first

Virty [35]

Answer:

5c+4d=10

3c+2d=16

8c+6c=26

8 0

2 years ago

A new crew of painters takes two times as long as the old painters. Together they can paint in 6 hours. How many hours does it t

babymother [125]

Let n be old painters time. Then the new painters are 2n. So:
1/n+1/2n=1/6
2+1=2n/6
2n=18
n=9
The old painters take 9 hours; the new ones take 18
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3 years ago