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ale4655 [162]
2 years ago
9

3. In the expression 25-5+7x3 ÷ 1, which operation should be done first?

Mathematics
1 answer:
satela [25.4K]2 years ago
5 0

Answer:

division

Step-by-step explanation:

please mark me as brainlest

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Please solve with explanation
valkas [14]

Answer:

a

Step-by-step explanation:

5 0
3 years ago
Q and r are independent events. if p(q) = 1/4 and p(r)=1/5, find p(q and r)
klasskru [66]

Answer:

(b) \frac{7}{30}

Step-by-step explanation:

When two p and q events are independent then, by definition:

P (p and q) = P (p) * P (q)

Then, if q and r are independent events then:

P(q and r) = P(q)*P(r) = 1/4*1/5

P(q and r) = 1/20

P(q and r) = 0.05


In the question that is shown in the attached image, we have two separate urns. The amount of white balls that we take in the first urn does not affect the amount of white balls we could get in the second urn. This means that both events are independent.


In the first ballot box there are 9 balls, 3 white and 6 yellow.

Then the probability of obtaining a white ball from the first ballot box is:

P (W_{u_1}) = \frac{3}{9} = \frac{1}{3}

In the second ballot box there are 10 balls, 7 white and 3 yellow.

Then the probability of obtaining a white ball from the second ballot box is:

P (W_{u_2}) = \frac{7}{10}

We want to know the probability of obtaining a white ball in both urns. This is: P(W_{u_1} and W_{u_2})  

As the events are independent:

P(W_{u_1} and W_{u_2})  = P (W_{u_1}) * P (W_{u_2})

P(W_{u_1} and W_{u_2})  = \frac{1}{3}* \frac{7}{10}

P(W_{u_1} and W_{u_2})  = \frac{7}{30}

Finally the correct option is (b) \frac{7}{30}

3 0
3 years ago
Pls help me in this
ddd [48]

Answer:

12 x 12 = 144

Step-by-step explanation:

12 times by 12 is 144

8 0
3 years ago
Read 2 more answers
What is 10 more than 451
snow_lady [41]
<span>To find 10 more than 451 is very simple, simply add 10 to 451 to get 461.</span>
8 0
3 years ago
Write 0.0004571 in scientific notation.
NISA [10]
Scientific notation means to write the answer in standard form. standard form helps you to express numbers that are too big or too small to be conveniently written in decimal form.
so for this case, it will be 4.571×10^-4.
when the number is decimal, you move the dot to the right and it will always be multiplying 10 to the power of a negative power.
6 0
3 years ago
Read 2 more answers
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