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yanalaym [24]
3 years ago
9

Dave has $13 to spend on a $4 book and two birthday cards (c) for his friends. How much can he spend on each card if he buys the

same card for each friend?
Mathematics
2 answers:
OverLord2011 [107]3 years ago
7 0
13 - 4 = 9 he can spend 4.50 for each of the card 
Neko [114]3 years ago
6 0
He can spend 3.50 on the card for each.
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3 years ago
Use the trend line to predict what the value of variable N will be when variable M equals 50.
ahrayia [7]

Answer:

N = 10

Step-by-step explanation:

Normally the coordinate system goes:

x axis (horizontal)

y axis (vertical)

Here, we have:

Horizontal axis as "M", and

Vertical axis as "N"

We want to know what N will be when M equals 50.

So, we look at the x-axis and go to M equals 50.

Then we move up until the "trend line". The intersection.

If we move directly left to vertical axis (N variable), we see that it is at the point:

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When M = 50, N = 10

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Galina-37 [17]

The percentage of the radioactive isotope left is 25.0000%.

<h3>What is the half life?</h3>

The half life of a radioactive isotope is the time that will elapse before only half of the number of original isotopes will remain.

Now;

We are told that;

Half life (t1/2) = 55 days

Time taken (t) =  115 days

Ratio of isotope remaining = N/No

Thus;

N/No = (1/2)^t/t1/2

N/No = (1/2)^115/55

N/No = (1/2)^2

N/No =1/4

Hence, the percentage = 1/4 * 100/1 = 25.0000%

Learn more about half life of an isotope:brainly.com/question/16387602

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2 years ago
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Step-by-step explanation:

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From the two triangle, we can see that triangle ADE is a dilation of triangle ABC by a scale factor of 2.

<h3>What is an equation?</h3>

An equation is an expression that shows the relationship between two or more numbers and variables.

From the diagram:

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DE² = 6² + 8²

DE = 10 units

From the two triangle, we can see that triangle ADE is a dilation of triangle ABC by a scale factor of 2.

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