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AleksandrR [38]
4 years ago
9

Can a real number be both rational and irrational?

Mathematics
1 answer:
Alexeev081 [22]4 years ago
8 0
Nope, it can only be one or the other
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To compound 50% solution in which proportion must 95% sol and 30% sol be mixed to make
Varvara68 [4.7K]

Answer:

4/9

Step-by-step explanation:

Let the amount of 95% sol = a ml and

the amount of 30% sol = b ml.

So, the total amount of the compound=a+b=500 ml

As the compound is 50% solution, so

95% of a + 30% of b= 50% of (a+b)

(95/100)a+(30/100)b=(50/100)(a+b) [from equation (i)]

95a + 30b = 50(a+b)

95(a/b)+30 = 50(a+b)/b [dividing both sides by b]

95(a/b)+30 = 50(a/b+1)

95(a/b)+30 = 50(a/b)+50

95(a/b)-50(a/b)=50-30

45(a/b)=20

a/b=20/45

a/b=4/9

Therefore, a:b=4:9

As a+b= 500 ml, so the amount of 95% sol = \frac {500}{13}\times 4=\frac{2000}{13}=153.85 ml

and the amount of 95% sol = \frac {500}{13}\times 9=\frac{4500}{13}=346.15 ml

Hence, the proportion of 95% sol and 30% sol to make a compound of 50% sol must be 4/9.

3 0
3 years ago
The temperature of magnesium must be at least 650 degrees for the metal to melt. A sample of magnesium is currently 255 degrees.
Agata [3.3K]
The total temperature of the magnesium sample is its original temperature plus the temperature increase which is dependent on time. This total should exceed 650 degrees. Thus, the inequality that best describes the condition is,                
                                        255 + 10m ≥ 650
                                                   m ≥ 39.5
The answer is letter b. 
8 0
4 years ago
Round the number 15.39624 to 2 decimal places​
hodyreva [135]

15.40 becauwe 6 makes 9to 0 and it makes 3 to 4

6 0
3 years ago
Read 2 more answers
What is the slope of the line shown below? (4, 8) (2, 4)
Zinaida [17]

Answer:

Slope = 2

Step-by-step explanation:

Slope is the change in y/change in x. So (8-4)/4-2)=2.

5 0
3 years ago
Read 2 more answers
Isabel put $4,000 into a saving account that pays interest monthly at a simple-interest rate of 2.5% per year. If she takes the
never [62]

9514 1404 393

Answer:

  $49.98

Step-by-step explanation:

The interest credited to Isabel's account each month is ...

  I = Prt

  I = $4000·(0.025)(1/12) = $8.33

If she withdraws that amount each month, the original balance is restored, and she will earn the same amount the next month.

Isabel's total earnings in 6 months will be ...

  $8.33 · 6 = $49.98

4 0
3 years ago
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