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Andru [333]
2 years ago
10

Use a special product pattern to evaluate

t="19^2-11^2" align="absmiddle" class="latex-formula">
I'm pretty sure I just normally solve it but I have no darn clue
Mathematics
1 answer:
Delvig [45]2 years ago
3 0

Answer:

240

Step-by-step explanation:

To evaluate 19^2 - 11^2, we have to use a special product pattern. Since this expression is in the form a^2 - b^2, we use the pattern (a + b)(a - b).

  • (19+11)(19-11)
  • (30)(8)
  • 240

Therefore, the answer is 240.

Have a lovely rest of your day/night, and good luck with your assignments! ♡

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Probability of selecting a red marble:
25/250 (since 25 out of 250 marbles are red)
Since the top and bottom of this fraction are both divisible by 25, we can go ahead and divide them both by 25, simplifying to 1/10.

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Simplifies to 1/5.

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\frac{1}{10}\times\frac{1}{5}\times\frac{7}{10}=\frac{1\times1\times7}{10\times5\times10}=\boxed{\frac{7}{500}}
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