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katrin [286]
2 years ago
8

8.5b−3.4∙(13a−3.2b)+a

Mathematics
1 answer:
Nesterboy [21]2 years ago
8 0

Answer:

8.5b - 3.4(13a - 3.2b) + a = 19.4b - 43.2a

Step-by-step explanation:

It is a simple mathematical problem with multiple like terms. We can solve it by applying basic mathematical rules of multiplication and addition/subtration.

8.5b - 3.4(13a - 3.2b) + a

= 8.5b - 3.4*13a -3.4*(-3.2b) + a

= 8.5b - 3.4*13a + 3.4*3.2b + a

= 8.5b - 44.2a + 10.88 b + a

Now, only like terms can be added to each other

= (8.5b + 10.9b) + (a - 44.2a)

= 19.4b + (-43.2a)

= 19.4b - 43.2a    

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Beth sold half of her comic books and then bought nine more. She now had 28. With how many did sh begin?
Vladimir79 [104]

Answer:

<h2><em><u>38</u></em></h2>

Step-by-step explanation:

She began with 38 books.

28 - 9 = 19

19(2) = 38

Hope this helps!

3 0
2 years ago
Read 2 more answers
The perimeter of the triangle is 44cm.if it’s sides are in the ratio 9:7:6.find its area
shepuryov [24]

Answer:

The area is 83.905 cm^3

Step-by-step explanation:

The total ratio is 9 + 7 + 6 = 22

So the length of the sides are as follows;

9/22 * 44 = 18 cm

7/22 * 44 = 14 cm

6/22 * 44 = 12cm

we can use Heron’s formula to find the area of the triangle

we find a first

s = (a + b + c)/2 = (18+14+12)/2 = 44/2 = 22

Mathematically, the Heron’s formula is as follows;

A = √s(s-a)(s-b)(s-c)

where a, b and c are 18,14 and 12 respectively

Plugging the values, we have;

A = √22(22-18)(22-14)(22-12)

A = √(22 * 4 * 8 * 10)

A = √(7,040)

A = 83.905 cm^3

3 0
2 years ago
Suppose that the exam scores for students in a large university course are normally distributed with an unknown mean and standar
HACTEHA [7]

Answer:

Critical value t-score=2.701.

Step-by-step explanation:

When we calculate a confidence interval with an unknown population standard deviation, we estimate it from the sample standard deviation and use the t-score instead of the z-score.

The critical value for t depends on the level of confidence and the degrees of freedom.

If the sample size is 42, the degrees of freedom are:

df=n-1=42-1=41

For a confidence level of 99% and 41 degrees of freedom, the critical value of t is t=2.701.

6 0
1 year ago
Reza paid $4,500 as a down payment on a car. She then made equal monthly paments of $250. Reza paid a total of $10,500 for her c
monitta
10500-4500=6000

6000/250=24

So the answer is 24 months, or 2 years.
6 0
2 years ago
If the number of equally likely sample outcomes of a single stage of an experiment is 4, what is the total number of elements in
Svetradugi [14.3K]

Answer:

The total number of elements in the sample space if the experiment has 3 stages is 64 ....

Step-by-step explanation:

The answer is C.

According to the given statement the number of equally likely sample outcomes of a single stage of an experiment is 4

To find the total number of elements in the sample space if the experiment has 3 stages, we just simply multiply 4 three times.

4³ = 4*4*4

= 64

Therefore  the total number of elements in the sample space if the experiment has 3 stages is 64 ....

6 0
2 years ago
Read 2 more answers
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