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Alla [95]
3 years ago
13

Write the equation 0.3x 2 + 5x - 7 = 0 in standard form and then choose the value of "b."

Mathematics
2 answers:
spin [16.1K]3 years ago
7 0
The answer is b = 50.

The general form of quadratic equation is
ax² + bx + c = 0.

To write the equation 0.3x²<span> + 5x - 7 = 0 in standard form, you must get rid of decimals. To do that, multiply the equation by 10:
</span>10 * (0.3x²<span> + 5x - 7) = 10 * 0
</span>10 * 0.3x² + 10 * 5x - 10 * 7 = 0
3x² + 50x - 70 = 0

Now compare this equation with the general formula:
ax² + bx  +   c  = 0
3x² + 50x - 70 = 0

Therefore, b = 50.
dimulka [17.4K]3 years ago
7 0

Answer:

B is the answer

Step-by-step explanation:

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Snezhnost [94]

Answer:

There are 685464 ways of selecting the 5-card hand

Step-by-step explanation:

Since the hand has 5 cards and there should be at least 1 card for each suit, then there should be 3 suits that appear once in the hand, and one suit that apperas twice.

In order to create a possible hand, first we select the suit that will appear twice. There are 4 possibilities for this. For that suit, we select the 2 cards that appear with the respective suit. Since there are 13 cards for each suit, then we have {13 \choose 2} = 78 possibilities. Then we pick one card of all remaining 3 suits. We have 13 ways to pick a card in each case.

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6 0
3 years ago
Simplify 12 + 3(2x - 3) + 4.
raketka [301]

Answer:

7 + 6x

Step-by-step explanation:

12 + 3(2x - 3) + 4 =

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7 + 6x

6 0
3 years ago
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Zolol [24]
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Answer:

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Step-by-step explanation:

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x = 3

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