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Anettt [7]
3 years ago
6

What is the value of the expression 12÷(−32)×7?

Mathematics
1 answer:
nadezda [96]3 years ago
5 0

Answer:

Step-by-step explanation:

\frac{12}{(-32)} \\ ×7 = -\frac{21}{8}

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Step-by-step explanation:

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3 years ago
Whats the product of 4/7 of 28
Elena-2011 [213]

28  * 4/7        you can first divide 28 by 7 first,  giving:-

= 4 * 4  

= 16   (answer)

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3 years ago
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What is the LCM of 20 and 15
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Answer:

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  • <em>Find the prime factors of the second number 15. </em>

<em>3, 5 </em>

  • <em>Multiply all the highest exponent prime factors is the LCM value. Which is, </em>

<em>60</em>

5 0
3 years ago
On a certain​ river, a paddleboat travels 12 miles upstream ​(against the​ current) in the same amount of time it travels 20 mil
marin [14]

Given :

a paddle boat travels  upstream = 12 miles

a paddle boat travels  downstream = 20 miles

speed of the current = 2 miles per ​hour

Let the speed of the boat =x

Let the time taken = t

We know the distance for upstream D= (boat speed - current speed) * time

the distance for downstream D= (boat speed + current speed) * time

Plug in all the values and variables in the distance

For upstream 12 = (x-2)t, then t = \frac{12}{x-2}

For downstream 20 = (x+2)t then t = \frac{20}{x+2}

we got two equations for t, equate it and solve for x

\frac{12}{x-2} = \frac{20}{x+2}

Cross multiply it

12(x+2) = 20(x-2)

12x + 24 = 20x - 40 (subtract 12x  and add 40 on both sides)

64 = 8x

x= 8

the speed of the boat in still water = 8 miles per hour



3 0
3 years ago
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How do you find the quadratic function with vertex (-2,5) and point (0,9)?
Anastaziya [24]

Answer: y = (x +2)² + 5

<u>Step-by-step explanation:</u>

y = a(x - h)² + k <em>where "a" is the leading coefficient and (h, k) is the vertex</em>

Since we don't know "a", we need to plug in the point (x, y) and the vertex (h, k) to solve for "a":  (x, y) = (0, 9) and (h, k) = (-2, 5)

y = a(x - h)² + k

9 = a(0 - (-2))² + 5

9 = a(0 + 2)² + 5

9 = a(2)² + 5

<u>-5 </u>   <u>          -5 </u>

4  =  a(4)

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Next, plug in "a" and the vertex (h, k):

y = a(x - h)² + k

y = 1(x +2)² + 5

y = (x +2)² + 5


6 0
4 years ago
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