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sergiy2304 [10]
4 years ago
14

Help pleasee

Mathematics
2 answers:
riadik2000 [5.3K]4 years ago
8 0
Set this up as a proportion with cement on top and sand on bottom.  Our proportions will look like this then: \frac{1}{3} = \frac{7}{x}.  Cross multiply to get x = 21.  So 21 shovels of sand is needed.
Mnenie [13.5K]4 years ago
6 0
Let x be the amount of cement and y be the amount of sand. If <span>the ratio of cement to sand for mortar is 1:3, then \frac{x}{y} = \frac{1}{3} and y=3x.
</span>
So, if <span>Sandy puts in x=7 shovels of cement, then she puts y=3\cdot 7=21 shovels of sand.
</span><span>
</span><span>Answer: 21 shovels of sand.
</span>
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The figure is made up of a hemisphere and a cone.<br><br>What is the exact volume of the figure?
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It would be 160 hoped I helped
5 0
3 years ago
Read 2 more answers
A real estate agent has 17 properties that she shows. She feels that there is a 50% chance of selling any one property during a
Likurg_2 [28]

Answer:

0.0011 = 0.11% probability of selling less than 3 properties in one week.

Step-by-step explanation:

For each property, there are only two possible outcomes. Either they are sold, or they are not. The chance of selling any one property is independent of selling another property. This means that the binomial probability distribution is used to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

In which C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

And p is the probability of X happening.

A real estate agent has 17 properties that she shows.

This means that n = 17

She feels that there is a 50% chance of selling any one property during a week.

This means that p = 0.5

Compute the probability of selling less than 3 properties in one week.

This is

P(X < 3) = P(X = 0) + P(X = 1) + P(X = 2)

In which

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

P(X = 0) = C_{17,0}.(0.5)^{0}.(0.5)^{17} \approx 0

P(X = 1) = C_{17,1}.(0.5)^{1}.(0.5)^{16} = 0.0001

P(X = 2) = C_{17,2}.(0.5)^{2}.(0.5)^{15} = 0.0010

P(X < 3) = P(X = 0) + P(X = 1) + P(X = 2) = 0 + 0.0001 + 0.0010 = 0.0011

0.0011 = 0.11% probability of selling less than 3 properties in one week.

5 0
3 years ago
I need an answer! NO LINKS! PLS ill give brainlist!
earnstyle [38]
I’m pretty sure it’s D. 84.4
3 0
2 years ago
What is the missing base for 1000= ____ to the power of 3
TiliK225 [7]
1000 = x^3

1000 cube root = x

10 = x

10*10 = 100

100*10 = 1000

Hope this helped, and please make me brainlest! :)
5 0
3 years ago
The width of a rectangle is 7 inches less than the length. The perimeter is 62 inches. Find the length and the width.
Reil [10]

Answer: Perimeter = 2(L) + 2(W) Length = 7W - 2 Perimeter = 60 60 = 14W - 4 + 2(W) 60 =16W - 4 64 = 16W Width = 4 Length = 7(4) - 2 Length = 26

I hope this helped!

Step-by-step explanation:

4 0
3 years ago
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