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guapka [62]
3 years ago
10

Of 60 cities, 3 have a lake and 29 have a river running through them. What fraction of these 60 cities have a lake or river runn

ing through them?
Mathematics
1 answer:
nekit [7.7K]3 years ago
6 0
Hello!

We know our denominator is 60, because that is the total amount of cities. Now, we must find our numerator:

3 + 29 = 32

Fraction: 32/60

You can simplify this by dividing both the numerator and denominator by 4:

32 ÷ 4 = 8 60 ÷ 4 = 15

FRACTION (SIMPLIFIED): 8/15
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you practice the piano for 30 min. each day. Write and solve an equation to find the total time t you spend practicing the piano
Tom [10]
Lets get all the information we need first.
A week has 7 days, you practice 30 min each day, so in a week you will practice a total time t of 30 min for 7 times, that is:
t = 7day(30 min/day)
t = 210 min
So in a week you will practice a total of 210 minutes.
7 0
2 years ago
Read 2 more answers
Multiply the following polynomials
Sophie [7]

Answer  (2x + 7) • (x2 - 2)

Step-by-step explanation:

please give me brainlest!!

Step by step solution :

Step  1  :

Trying to factor as a Difference of Squares :

1.1      Factoring:  x2-2

Theory : A difference of two perfect squares,  A2 - B2  can be factored into  (A+B) • (A-B)

Proof :  (A+B) • (A-B) =

        A2 - AB + BA - B2 =

        A2 - AB + AB - B2 =

        A2 - B2

Note :  AB = BA is the commutative property of multiplication.

Note :  - AB + AB equals zero and is therefore eliminated from the expression.

Check : 2 is not a square !!

Ruling : Binomial can not be factored as the difference of two perfect squares.

Final result :

 (2x + 7) • (x2 - 2)

6 0
3 years ago
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How can you use a rate to compare the costs of two boxes of cereal that are different sizes?
Rainbow [258]

Answer:

✖ both sides

Step-by-step explanation:

you take both numbers and you multiply it

3 0
2 years ago
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The numerical coefficient of -2pqr
VMariaS [17]

Answer:  -2

Explanation: The coefficient is the number to the left of the variable.

Another example would be that 10xy has the coefficient 10.

Something like x^2 has coefficient 1 because x^2 = 1x^2.

7 0
3 years ago
Amira is told there is a trick to finding the slope within an equation in standard form, Ax+By=C. She is told she can rewrite th
Advocard [28]

Answer:

B. In slope-intercept form, the slope is − 7/9. These values are A and B, but with the opposite sign, so the slope of the line from the equation in standard form is − A/B.

Step-by-step explanation:

<u>Let's convert the standard equation into slope-intercept form:</u>

  • Ax + By = C              ⇒ subtract Ax from both sides
  • By = -Ax + C             ⇒ divide both sides by B
  • y = -A/Bx + C/B        ⇒ converted to slope- intercept form

As we see the slope is -A/B

<u>The equation 7x + 9y = 14 is converted as:</u>

  • y = -7/9x + 14/9, where the slope is -7/9

<u>Looking at the answer options and the correct one is option B, where both identification of slopes match.</u>

  • B. In slope-intercept form, the slope is − 7/9. These values are A and B, but with the opposite sign, so the slope of the line from the equation in standard form is − A/B.

4 0
3 years ago
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