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3 years ago

How do you calculate average time from a data set? These are the times: 2.22s, 2.14s, and 2.10s.

1 answer:

6 0

You would add them all and then decide them by how many numbers there are witch would be 3.

2.22. 3/6.46 =2.1533
2.14.
+2.10
———
6.46

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The cost of purchasing a bag of rice is partly constant and partly varies inversely as the square root of the number of people d

algol [13]

Answer:

(a) 160 Naira

(b) Undefined

Step-by-step explanation:

Given

Let:

$y \to$ cost of bag of rice

$x \to$ people demanding the bag

So, we have:

$y\ = \frac{k}{\sqrt x} + c$ ---- The variation

$y = 100; x = 36$

$y = 150; x = 144$

We have:

$y\ = \frac{k}{\sqrt x} + c$

When: $y = 100; x = 36$

$100 = \frac{k}{\sqrt {36}} + c$

$100 = \frac{k}{6} + c$ -- (1)

When: $y = 150; x = 144$

$150 = \frac{k}{\sqrt {144}} + c$

$150 = \frac{k}{12} + c$ --- (2)

Subtract (1) from (2)

$150 - 100 = \frac{k}{12} - \frac{k}{6} + c - c$

$50 = \frac{k}{12} - \frac{k}{6}$

Multiply through by 12

$600 = k - 2k$

$600 = -k$

$k = -600$

To solve for x, we have:

$100 = \frac{k}{6} + c$ -- (1)

This gives:

$100 = \frac{-600}{6} + c$

$100 = -100 + c$

$c = 100 + 100$

$c = 200$

So, the equation is:

$y\ = \frac{k}{\sqrt x} + c$

$y = -\frac{600}{\sqrt x} + 200$

Solving (1): y; when x = 225

We have:

$y = -\frac{600}{\sqrt x} + 200$

$y = -\frac{600}{\sqrt {225}} + 200$

$y = -\frac{600}{15} + 200$

$y = -40 + 200$

$y = 160$

Solving (2): x; when x = 200

We have:

$y = -\frac{600}{\sqrt x} + 200$

$200 = -\frac{600}{\sqrt x} + 200$

Collect like terms

$\frac{600}{\sqrt x} = 200 - 200$

$\frac{600}{\sqrt x} =0$

Cross multiply

$600 =0 * \sqrt x$

$600 =0$

<em>x is undefined</em>

7 0

3 years ago

Can somebody help me with this ?? :)

NemiM [27]

The answer is C. If the verticle line intersects with the graph more than once, it is NOT a function.

8 0

3 years ago

7^2 + 2 (\sqrt(81)+ \sqrt(42))

lana66690 [7]

Answer:

49 + 246 qrst

Step-by-step explanation:

3 0

3 years ago

What is the measure of angle B in the triangle?

pentagon [3]

Answer: Angle B measures 70 degrees

Step-by-step explanation: One angle is given as 40 while the other two angles are yet unknown.

Remember that the sum of the interior angles in a triangle equals 180 degrees. In other words

Angle A + Angle B + Angle C = 180

Therefore

40 + (2x - 30) + (x + 20) = 180

40 + 2x - 30 + x + 20 = 180

By collecting like terms we have

40 - 30 + 20 + 2x + x = 180

30 + 3x = 180

Subtract 30 from both sides of the equation

3x = 150

Divide both sides of the equation by 3

x = 50

Having calculated x = 50 we can now compute the value of angle B as follows;

When x = 50,

2x - 30 becomes

2(50) - 30

= 100 - 30

= 70.

Angle B measures 70 degrees

8 0

3 years ago

What's the answer to x+5=10

noname [10]

X=5 because you subtract 5 from both sides and then you get x=5 remainding

6 0

3 years ago

Read 2 more answers