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olya-2409 [2.1K]
3 years ago
6

At a hardware store, each wooden plank costs $3.57. How much do 12 planks cost? $

Mathematics
1 answer:
BigorU [14]3 years ago
3 0

Answer:

42.84

Step-by-step explanation:

3.57*12=42.84

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Diana had a large stack of playing cards. She knew that 17 of them were kings. She took a sample of 30 cards and found 4 kings.
Mandarinka [93]

Answer:

Diana approximately had 128 cards

Step-by-step explanation:

Let n  be the number of cards Diana had. She knows that

  • there are 17 kings among n cards
  • 4 kings among 30 cards

Write a proportion:

\dfrac{17}{n}=\dfrac{4}{30}

Cross multiply:

4n=17\cdot 30\\ \\4n=510\\ \\n=\dfrac{510}{4}=127.5\approx 128

5 0
3 years ago
Convert 11.42424242 to a rational expression in the form of a/b , where b ≠ 0.
TiliK225 [7]
11.424242
isolate the repeating part
11+0.424242

focus on the repeating part
0.42424242
how many places till it repeats again?
2
let's say it is x
x=0.42424242
multiply by 100
100x=42.424242

subtract them
100x-x=42.42424242-0.42424242
the infinite repeats cancel and we get
99x=42
divide by 99
x=\frac{42}{99}



so
11.\overline{42}=11 \space\ \frac{42}{99}
5 0
4 years ago
Read 2 more answers
It is known that 70% of the customers in a sporting goods store purchase a pair of running shoes. A random sample of 25 customer
Musya8 [376]

Answer:

Binomial distribution

Step-by-step explanation:

For each person, there are only two possible outcomes. Either they purchase a pair of running shoes, or they do not. Customers' purchases are made independently. This means that the probability distribution of X is the binomial probability distribution.

6 0
3 years ago
0.06 is one tenth of what number?
8_murik_8 [283]

Answer:

0.6

Step-by-step explanation:

0.06 is one-tenth of the number that is 10 times bigger than 0.06.

0.06 * 10 = 0.6

0.06 is one-tenth of 0.6.

6 0
3 years ago
Read 2 more answers
Elevation is a measure of height in relation to sea level. The highest feature on Earth is Mount Everest with an elevation +29,0
Sphinxa [80]

Answer:

Sea\ Level = 0\ ft

The farthest point is the Challenger Deep

Step-by-step explanation:

Given

Highest = +29029ft

Least = -35,797ft

Solving (a): The sea level

Both elevations had signs in front of them.

The sea level is the point at the neutral level, neither positive nor negative.

Hence:

Sea\ Level = 0\ ft

Solving (b): Farthest Point.

The farthest point is the one with the highest magnitude.

Comparing

Highest = +29029ft  to   Least = -35,797ft

-35,797 ft has the highest magnitude.

Hence:

<em>The farthest point is the Challenger Deep</em>

5 0
3 years ago
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