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Vedmedyk [2.9K]
2 years ago
6

Please help me with these two. i have no teacher and i do not recall trhis

Mathematics
1 answer:
Marianna [84]2 years ago
5 0

Answer:

It shows a contradiction because (a − 4b) / b is a rational number and √5 is an irrational number.

Step-by-step explanation:

A rational number can be written as a ratio of two integers.

An irrational number cannot.

(a − 4b) / b is a rational number.

√5 is an irrational number.

You might be interested in
How many solutions does the system have?
alisha [4.7K]

Answer:

y = 3/2 , x = 3/2

Step-by-step explanation:

Solve the following system:

{x + y = 3 | (equation 1)

10 x = 15 | (equation 2)

Divide equation 2 by 5:

{y + x = 3 | (equation 1)

0 y+2 x = 3 | (equation 2)

Divide equation 2 by 2:

{y + x = 3 | (equation 1)

0 y+x = 3/2 | (equation 2)

Subtract equation 2 from equation 1:

{y+0 x = 3/2 | (equation 1)

0 y+x = 3/2 | (equation 2)

Collect results:

Answer: {y = 3/2 , x = 3/2

6 0
3 years ago
at 4:00 am the temperature was -9 degrees f. at noon the temperature was 18 degrees f. what was the change in temperature
Nutka1998 [239]
There was a change of 27 degrees F.
7 0
3 years ago
The graph of an absolute value function has a vertex of (2,3) and crosses the x-axis at (−1,0) and (5,0). What is the equation f
frez [133]

Answer:

Option D.

Step-by-step explanation:

The vertex form of an absolute function is

y=a|x-h|+k

where, a is a constant, (h,k) is vertex.

It is given that, vertex of an absolute function is (2,3). So, h=2 and k=3.

y=a|x-2|+3   ...(1)

It crosses the x-axis at (5,0). So put x=5 and y=0 to find the value of a.

0=a|5-2|+3

-3=3a

-1=a

Put a=-1 in (1).

y=(-1)|x-2|+3

y=-|x-2|+3

Now, put y=0, to find the equation for this absolute value function when y=0.

0=-|x-2|+3

Therefore, the correct option is D.

4 0
3 years ago
Read 2 more answers
What is the solution to the problem expressed to the correct number of significant figures? 15. 11 (142 × 16. 5) = ? A. 2,358 B.
olchik [2.2K]

The solution to the problem expressed  2358.

<h3>What is the meaning of significant figure?</h3>

Significant figure It is defined as the minimum number of digit us needed to express a number in scientific notation.

Therefore we get,

15.11+(142\times16.5)

First we have to multiply the given digits as per rule.

=15.11+2343

Now we will add both the digits, we get

=2358.11

As per given expression, we conclude that the number of significant figure is 4.

So, the answer will be, 2358.

Therefore, the correct option is, 2358.

To learn more about the significant figures visit:

brainly.com/question/24491627

8 0
1 year ago
It takes 3/4 of a cup of sugar to make one batch of cookies how many cups of sugar does he need to double the recipe
zmey [24]

Answer:

Step-by-step explanation:

3/4 cups → 1 batch

x cups    → 2 batches

 

x = 2(3/4) = 6/4 = 1 1/2 cups

 

3/4 cups → 1 batch

y cups → 9 batches

y = 9(3/4) = 6 3/4 cups

5 0
2 years ago
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