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4 years ago

Evaluate this expression: 8-10x-2x^2 when x=5

Mathematics

2 answers:

Oduvanchick [21]4 years ago

5 0

Answer:

-142

Step-by-step explanation:

8-10 (5) - 2 (5) 6^2

8-50 - 10 ^ 2

8-50-100

-142

Neporo4naja [7]4 years ago

4 0

Answer:

-92

Step-by-stepxplanation:

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Points D and E are midpoints of the sides of triangle ABC. The perimeter or the triangle is 48 units. What is the value of t?

Komok [63]

Answer:

2 units

Step-by-step explanation:

A triangle is a polygon with three sides and three angles. Types of triangle are acute, obtuse, scalene, isosceles, equilateral and right angled triangle.

Since point D and E are midpoints of the sides of triangle ABC, hence:

AD = BD = 3t, BE = CE = 4t, AC = 7t + 6

The perimeter of triangle ABC = AC + BC + AB = AC + AD + BD + BE + CE;

Substituting:

48 = 7t + 6 + 3t + 3t + 4t + 4t = 21t + 6

48 = 21t + 6

21t = 42

t = 2 units

8 0

3 years ago

What kind of association is this, negative or positive?

erik [133]

Answer:

negative association

Step-by-step explanation:

This diagram is a scatter plot which represents a set of data. Data on a scatter plot can fit one of three descriptions: positive (increasing), negative (decreasing) or no association (points do not form any kind of line). Given this data and the line of best fit, or the line that pass through the majority of the points, it is a decreasing line. Since the line goes downhill, it is a negative association.

7 0

4 years ago

An air traffic controller has noted that it clears an average of seven planes per hour for landing. What is the probability that

Vesna [10]

Answer:

a) 0.0989, Option a

Step-by-step explanation:

The concept of <em>Poisson probability distribution</em> is used as shown in the attached file.

8 0

3 years ago

Isabella ran the 100-meter dash five times. The time it took her to complete each race, in seconds, was 12.7, 12.807, 12.78, 12.

Stells [14]

Given:

Number of 100-meter races = 5

The time it took Isabella to complete each race, in seconds, was 12.7, 12.807, 12.78, 12.08, and 12.087.

To find:

The decimals in order from greatest to least.

Solution:

The time it took Isabella to complete each race, in seconds, was shown below:

12.7, 12.807, 12.78, 12.08, 12.087

We need to arrange this data in descending order.

In all 5 numbers the digits before decimals are same. On comparing the digits on the tenth place and hundredth place, we get

12.807 > 12.78 > 12.7 > 12.087 > 12. 08

Therefore, the required order of given data is 12.807, 12.78, 12.7, 12.087, 12. 08.

7 0

3 years ago

A square has an area of 15in^2. what is the approximate side lengths of the card

Akimi4 [234]

Square area=side^2
15=area=side^2
sqrt both sides
√15=side
aprox
3.87298=side

about 3.9in

5 0

3 years ago

Read 2 more answers