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Dmitrij [34]
4 years ago
15

1. Evaluate 7m + 3mn; when m=8 and n=14?

Mathematics
1 answer:
FrozenT [24]4 years ago
3 0

Answer:

1. 392

2. 75

3. 12x^{2} - 5x -2

Step-by-step explanation:

1. 7×8 + 3×8×14 = 56 + 336 = 392

2. 675 ÷ (6 + 3) = 675 ÷ 9 = 75

3. 12x^{2} + 3x - 8x - 2 = 12x^{2} -5x-2

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a rino can run at speeds about 28 miles per hour. what is that speed in feet per secsec, to the nearest whole number? (Remember
Solnce55 [7]

Remark

You can use  a method called unit analysis to solve this problem. You will use it many times in your education later on.

Solve

\dfrac{28 mile}{hour} *\dfrac{5280 feet}{mile}*\dfrac{1 hour}{60 min}*\dfrac{1 min}{60 sec}

Now sort out the numbers  in the numerator and those in the denominator and multiply them together.

<em><u>Numerator</u></em> 28 * 5280 * 1 * 1 = 147840

<em><u>Denominator:</u></em> 60 * 60 = 3600

Now divide the numerator by denominator

Answer = 147840 / 3600 = 41.1 Feet / second

28 miles per hour = 41.1 feet / second

7 0
4 years ago
Which of the expressions are in simplified form​
hram777 [196]

Answer: number 1

Step-by-step explanation:

number 1

3 0
3 years ago
A 34 foot tall poll is supported by 2 wires that are anchored 8 feet from the base of the pole how many feet or wire is needed f
zalisa [80]

Using the Pythagorean theorem:

Length of wire = sqrt(34^2 + 8^2)

Length of wire = sqrt(1156 +64)

Length of wire = sqrt(1220)

Length of wire = 34.9285 feet

There are 2 wires:

34.9285 x 2 = 69.857 feet

Round off as needed.

5 0
3 years ago
Read 2 more answers
P and Q are points on the line y= 2 -4x complete the coordinates of P and Q, P(0, ) Q( ,0)
docker41 [41]
(d): y=2-4x
P(0;y) belongs to (d)
=> y=2-4*0
= 2
So P(0;2)
Q(x;0) belongs to (d)
=> 0=2-4*x
<=> x=1/2
So Q(1/2;0)
4 0
4 years ago
(02.03)
Dmitry [639]

The use of ratio language was used in the following sentences:

For every 1 students out of school, there are 10 students in school

For every 5 apples John eats, he eats 20 boxes of chocolate

For every 5 minutes,  study, I sleep for 1 hour

Ratio is used to show the relationship that exists between numbers. It shows the frequency of the number of times that value of one number is contained within the value of another number or numbers

For example, There are 3 apples and 20 oranges. If I want to express the relationship between apples and oranges as a ratio. The ratio will be 3 : 20 . It means for every 3 apples, there are 20 oranges.

To learn more about ratios, please check: brainly.com/question/13419413?referrer=searchResults

8 0
3 years ago
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