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maxonik [38]
3 years ago
14

Xis directly proportional to y.

Mathematics
1 answer:
OleMash [197]3 years ago
6 0
X = k x y
21 = k x 3
k = 7
x = 7y

x = 7(10)
x = 70
You might be interested in
"If you subtract 12 from my number and multiply the difference by -15 ​, the result is -140​." What is ​'s ​number?
Masteriza [31]

Answer:

The answer would be 2.7. Am not very sure though

Step-by-step explanation:

So what you do is

for example the unkown number is x and the answer you get is y

12-x=y * -15=-140

-140/-15=9.33 (this is y the answer)

12-x=9.3

12-9.3=2.7

To check your answer

12-2.7=9.3

9.3 * -15=-139.5 if you round it then it would be -140

6 0
3 years ago
a regular polygon has a perimeter of 36 inches. each side is exactly 6 inches long. which figure does this discribe?
fgiga [73]
Since a side is only 6 inches long and the total perimeter is 36; take 36/6 and you get 6. The only figure with six sides is a hexagon, thus your answer is hexagon.
3 0
3 years ago
2. Explain how the number of edges for the rectangular
Tems11 [23]
There’s more corners and sides to a rectangular prism than a cube
6 0
3 years ago
I have 6 feet of licorice and I want to share it with my friends. If each person gets
padilas [110]

Answer:9 people

Step-by-step explanation:

6/3/2= 6x3/2 =9.

7 0
3 years ago
Mr. Robinson traveled to a city 210 miles from his home to attend a meeting. Due to car trouble, his average speed returning was
Mnenie [13.5K]

Answer: the average speed at which he traveled to the city is 74.8 mph

Step-by-step explanation:

Let x represent the rate or speed at which he traveled to the city. Due to car trouble, his average speed returning was 9 mph less than his speed going. It means that the speed at which he returned is (x - 9) mph.

Time = distance/speed

Assuming the distance travelled to and from the city is the same ie 210 miles, then

Time spent in travelling to the city is

210/x

Time spent in travelling back from the city is

210/(x - 9)

If the total time for the round trip was 6 hours, it means that

210/x + 210/(x - 9) = 6

Multiplying both sides of the equation by x(x - 9), it becomes

210(x - 9) + 210x = 6x(x - 9)

210x - 1890 + 210x = 6x² - 54x

6x² - 54x - 210x - 210x + 1890 = 0

6x² - 474x + 1890 = 0

We would apply the general formula for solving quadratic equations which is expressed as

x = [- b ± √(b² - 4ac)]/2a

From the equation given,

a = 6

b = - 474

c = 1890

Therefore,

x = [- - 474 ± √(- 474² - 4 × 6 × 1890)]/2 × 6

x = [474 ± √(224676 - 45360)]/12

x = [474 ± √179316]/12

x = (474 + 423.5)/14 or x = (474 - 423.5)/12

x = 74.8 or x = 4.2

Checking,

For x = 74.8

210/74.8 + 210/(74.8 - 9) = 6

= 2.8 + 3.2 = 6

Therefore, x = 74.8 mph

4 0
3 years ago
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