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3 years ago

5

What is the sum 3/7 + 1/2

2 answers:

marin [14]3 years ago

8 0

Answer:

6/14 + 7/14 = 13/14

masya89 [10]3 years ago

4 0

Answer:

13/14

Step-by-step explanation:

3/7+1/2

LCM = 14

6/14+7/14=13/14

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The supply equation of a certain commodity is given by the equation: p = 20 + 3 where p is the price (in dollars) and s is the q

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3 years ago

A car goes around a turn too quickly, it can leave tracks that form an arc of a circle. By finding the radius of the circle, acc

ANTONII [103]

Check the picture below.

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2 years ago

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7 0

3 years ago

A plane flew 720 mi with a steady 30 mi/h tailwind. The pilot then returned to the starting point, flying against that same wind

NNADVOKAT [17]

Answer:

Plane's speed is 150 miles/hour

Step-by-step explanation:

Let the plane's airspeed be x

Speed of wind is 30 miles/hour

When a plane flew with the wind , Speed = (x+30)

So, the speed plain with wind on going = (x+30)

Since we are given that on returning plane fly against the wind .

So,When a plane flew against the wind , Speed = (x-30)

So, the speed plain against wind on returning = (x-30)

Distance = 720 miles .

$Time = \frac{Distance}{Speed}$

So, time on going $=\frac{720}{(x+30)}$

Time on returning $=\frac{720}{(x-30)}$

Now we are given that the total time for the whole trip (going + returning) = 10 hours.

So, $\frac{720}{(x+30)}+\frac{720}{(x-30)}=10$

$\frac{720x-21600+720x+21600}{(x+30)(x-30)}=10$

$720x-21600+720x+21600=10(x+30)(x-30)$

$720x+720x=10(x+30)(x-30)$

$1440x=10(x^2 -[30]^2)$

$144x=x^2 -900$

$x^2-144x -900=0$

$x^2-150x+6x -900=0$

$x(x-150)+6(x -150)=0$

$(x-150)(x+6)=0$

$x= 150,x= -6$

So, the plane's speed is 150 miles/hour

4 0

3 years ago

Evaluate the following<br> 28÷4+9+2x7

dexar [7]

Simply the expression which is 30

5 0

4 years ago

Read 2 more answers