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Rashid [163]
3 years ago
8

The mass of a grain of sand is about 10^-3 gram. About how many grains of sand are in the bag of sand?

Mathematics
1 answer:
nika2105 [10]3 years ago
8 0

there are 10 million grains in that bag of sand this is because one grain equals to 10 power -3 what about 10 kg you change it into grams then you cross multiply and get the answer

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How long will it take you to drive 175 miles of 25 miles per hour
Paha777 [63]
So if you're driving 25 miles per hour, it would take you 7 hours to drive 175 miles. 175 miles ÷ 25 miles = 7 hours.
8 0
3 years ago
Read 2 more answers
1) Given P(A) = 0.3 and P(B) = 0.5, do the following.
Delicious77 [7]

Answer:

1) a) 0.8

b) 0.6

2) a) 0.08

b) 0.14

Step-by-step explanation:

1) Given

P(A) = 0.3 and P(B) = 0.5

Let us learn about a formula:

P(A\ or\ B) = P(A) +P(B) -P(A\ and\ B)\\OR\\P(A\cup B) = P(A) +P(B) -P(A\cap B)

(a) If A and B are mutually exclusive i.e. no common thing in the two events.

In other words:

P(A\ and\ B) = P(A \cap B) = 0

Using above formula:

P(A\ or\ B) = P(A) +P(B) -P(A\ and\ B)\\\Rightarrow P(A\ or\ B) = 0.3 + 0.5 -0 = \bold{0.8}

(b)  P(A and B) = 0.2

Using above formula:

P(A\ or\ B) = P(A) +P(B) -P(A\ and\ B)\\\Rightarrow P(A\ or\ B) = 0.3 + 0.5 -0.2 = \bold{0.6}

*************************************

1) Given

P(A) = 0.4 and P(B) = 0.2

Let us learn about a formula:

P(A\ and\ B) = P(B) \times P(A/B)  for dependent events

P(A\ and\ B) = P(A) \times P(B) for independent events.

(a) If A and B are independent events :

Using the above formula for independent events:

P(A\ and\ B) = 0.4 \times 0.2 = \bold{0.08}

(b)  P(A / B) = 0.7

Using above formula:

P(A\ and\ B) = P(B) \times P(A/B) = 0.2 \times 0.7 = \bold{0.14}

6 0
3 years ago
-5(9 - 6k) with k = -3
Jobisdone [24]

Answer:

-135

Step-by-step explanation:

-5(9 - 6k)

Let k = -3

-5 ( 9 - 6*-3)

-5 ( 9 + 18)

-5 ( 27)

3 0
2 years ago
3) Michael is getting dinner for his drama club on the evening of their final rehearsal.
bagirrra123 [75]

Answer:

5.5p + 5 ≤ 60

10 pounds

Step-by-step explanation:

a) The maximum total cost he can spend is $60.

5.5 * p + 2 * 2.5 ≤ 60

Simplify.

5.5p + 5 ≤ 60

b) Solve 5.5p + 5 ≤ 60

Subtract 5 from both sides

5.5p ≤ 55

Divide both sides by 5.5

p ≤ 10

So, the maximum he can buy is 10 pounds of food

5 0
3 years ago
Record the results of the class demonstrations and discussions in your notes.
lana [24]
You shoulda just paid attention to class my guy, nobody can answer this.
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