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Burka [1]
3 years ago
8

The width of a rectangle is the length minus 6 units. The area of the rectangle is 27 units.The area of the rectangle is 27 unit

s. What is the length, in units, of the rectangle?
Mathematics
1 answer:
Alexxandr [17]3 years ago
5 0

Answer:

The length is 9 units.

Step-by-step explanation:

x will be our length so we get:

x*(x-6)=27

You can just try the factors of 27 as x.

Let's guess x is 9

9*(9-6)=27

9*3=27

Which is true, so the <u>length must be 9</u> and the width must be 6.

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I’m completely lost. Answer?
aliya0001 [1]
I think it's true because its the same data set just put in order backwards.


Hope this helps!! :-)
3 0
3 years ago
In a statistics​ class, the standard deviation of the heights of all students was 3.8 inches. The standard deviation of the heig
goblinko [34]

Answer:

The reason why standard deviation of the entire class is greater than standard deviation of males and females considered separately, is that mean values for males and females are different from each other.

Step-by-step explanation:

The concept of mean is well represented by the following formula

mean = \frac{(x1 + x2 + x3 + ..... + xn)}{N}, where x1, x2, xn are the observations and N is the number of observations (population).

Standard deviation represents the distance between each observation and the mean of the population (all observations). The formula for this parameter is:

Standard deviation =√[((x1 - x)² + (x2-x)² + ....+ (xn-x)²)/N-1], where x1, x2,..., xn are the observations and x is the mean value.

In this case you have that each height registered is an observation and the number of observations represents the N value. As you can see if the mean for males is different from that of females their standard deviation will be different too. Usually males have heigths greater than that of females (1.77 vs 1.64, in USA for example), and heights inside each group will be more similar than between groups. Then, when you mix all observation there will be an increase in standard deviation, because you are mixing very different heigths

4 0
3 years ago
What does this equal y &gt;4x - 5
Tresset [83]

Answer:

This represents the graph area above the line y = 4x - 5 shaded.

Step-by-step explanation:

y > 4x - 5 is an inequality.  First we graph y = 4x - 5, which has y-intercept (0, -5) and slope 4.  Next, we shade all of the area above this line (because the inequality y > 4x - 5 says that all y values are above 4x - 5).

3 0
2 years ago
Substitute 10 for z in z -5 &lt; 7
EleoNora [17]
Then it would be 10-5 < 7
so if you solved it it would be 5 < 7
So this statement is true
4 0
3 years ago
Someone quickly hell
Elza [17]

Answer:

£3,780

Step-by-step explanation:

Total rows = 19 rows

Seats per row = 28 seats

Cost of tickets per seats = £8.75

Total number of seats at the concert = Total rows × seats per row

= 19 rows × 28 seats

= 532 seats

The tickets for 100 seats have not been sold

Total number of tickets = sold tickets + unsold tickets

532 = sold tickets + 100

532 - 100 = sold tickets

432 = sold tickets

Sold tickets = 432 tickets

Total cost estimate of sold tickets = sold tickets × cost of tickets per seats

= 432 × £8.75

= £3,780

3 0
3 years ago
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