All categories

3 years ago

If n represents a number, then write an expression for a number that is twice n

Mathematics

1 answer:

DaniilM [7]3 years ago

4 0

Answer:

y=n(2)

Step-by-step explanation:

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A sum of £350 is invested at simple interest and amounts to £476 after 3 years. Calculate

Sliva [168]

Answer:

(a) $126

(b) .453333%

Step-by-step explanation:

(a) 476 - 350 = $126

(b)

$si = p \times r\times t \\ 476 = 350 \times r\times 3 \\ 476 = 1050r \\ \frac{476}{1050} = r \\ r = 0.453333\%$

7 0

2 years ago

The figure below shows a triangular prism and its net. What is the surface

almond37 [142]

The surface area is 64.48

5 0

3 years ago

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What is the constant rate of the change shown in the graph

Nutka1998 [239]

The constant rate is one

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3 years ago

The following data represent the number of people aged 25 to 64 years covered by health insurance (private or government) in 2

Yuri [45]

The mean age is equal to: 44.09.

The standard deviation is equal to: 10.07.

<h3>How to determine the mean age and standard deviation?</h3>

First of all, we would determine the median of each class interval as follows:

Median 1 = (25 + 34)/2 = 29.5

Median 2 = (35 + 44)/2 = 39.5

Median 1 = (45 + 54)/2 = 49.5

Median 1 = (55 + 64)/2 = 59.5

Next, we would calculate the mean age by using this mathematical expression:

Mean age = ∑fx/∑f

Substituting the given parameters into the formula, we have;

Mean age = [(24.3 × 29.5) + (36.1 × 39.5) + (36.7 × 49.5) + (20.9 × 59.5)]/(24.3 + 36.1 + 36.7 + 20.9)

Mean age = [716.85 + 1,425.95 + 1,816.65 + 1,243.55]/118

Mean age = [5,203]/118

Mean age = 44.09.

Now, we can calculate the standard deviation as follows:

Standard deviation, S = √((∑f(xi - μ)²/∑f)

Standard deviation, S = √((24.3 × (29.5 - 44.09)² + (36.1 × (39.5 - 44.09)² + (36.7 × (49.5 - 44.09)² + (20.9 × (59.5 - 44.09)²)/(24.3 + 36.1 + 36.7 + 20.9))

Standard deviation, S = √((5172.70 + 760.56 + 1,074.14 + 4,963.08)/118)

Standard deviation, S = √(11,970.48/118)

Standard deviation, S = √101.5

Standard deviation, S = 10.07.

Read more on standard deviation here: brainly.com/question/14676082

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6 0

1 year ago

Kelly is a salesperson at a shoe store, where she must sell a pre-set number of pairs of shoes each month. At the end of each wo

Julli [10]

Answer: The initial number of shoes in the store is 300.

Step-by-step explanation:

Given : Kelly is a salesperson at a shoe store, where she must sell a pre-set number of pairs of shoes each month.

At the end of each work day the number of pairs of shoes that she has left to sell that month is given by the equation

$S=300-15x$ , where S = Number of pair of shoes Kelly still needs to sell.

x = Number of days she has worked that month.

When x= 0 , we get S= 300

i.e. When she started working in that month , she has 300 pairs of shoes to sell.

Therefore , Number 300 means that the initial number of shoes in the store is 300

7 0

3 years ago