Help please now 20 points

Mathematics

1 answer:

Travka [436]3 years ago

4 0

Answer:

2/5

Step-by-step explanation:

The theoretical probability of getting blue is TOTAL BLUE SPUN/ TOTAL SPINS

There were 12 blue spins out of 30 total spins, making the probability equal to 12/30 = 2/5

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4. What do you call a set that contains no element?

Sever21 [200]

Answer:

d. empty or null set is the answer

7 0

3 years ago

Paul had a job during his summer vacation. He earned $8.75 per hour. He worked 20 hours per week for 8 weeks. How much money did

Elan Coil [88]

Answer:

9800 is final answer. He rich :)

Step-by-step explanation:

Alright first let's find how much he makes each day.

20 * 8.75= 175

Now there are 7 days a week so...

175 * 7=1225

He works for 8 weeks:

1225 *8= 9800

8 0

4 years ago

7+3√5/3+√5 - 7-3√5/3-√5 = a + b√5

daser333 [38]

<h3>Given:-</h3>

$\\ \sf \implies\frac{7 + 3 \sqrt{5} }{3 + \sqrt{5} } - \frac{7 - 3 \sqrt{5} }{3 - \sqrt{5} } = a + \sqrt{5} b \\$

The value of a and b

<h3>Solution:-</h3>

$\\ \sf \implies\frac{7 + 3 \sqrt{5} }{3 + \sqrt{5} } - \frac{7 - 3 \sqrt{5} }{3 - \sqrt{5} } = a + \sqrt{5} b \\$

$\\ \sf \implies\frac{( \: 7 + 3 \sqrt{5} \: \: ( 3 - \sqrt{5}) \: \: - 7 - 3 \sqrt{5} \: \: ( 3 + \sqrt{5}) \: }{(3 + \sqrt{5}) \: \:(3 + \sqrt{5}) } = a + \sqrt{5} \: b\\$

$\\ \sf \implies\frac{( \: 21 - 7 \sqrt{5} \: + 9 \sqrt{5} - 15) \: \: - ( \: 21 + 7 \sqrt{5} \: - 9 \sqrt{5} + 15)\: }{(3 + \sqrt{5}) \: \:(3 + \sqrt{5}) } = a + \sqrt{5} \: b\\$