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4 years ago

It is given that y varies directly as x. if y = 5 when x = 4 determine the constant of variation.

Mathematics

1 answer:

myrzilka [38]4 years ago

3 0

D is the correct answer!!!

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Which shows the expression below in simplified form?

statuscvo [17]

Answer:

B. 9x10^4

Step-by-step explanation:

$\frac{4.5 \times {10}^{8} }{5 \times {10}^{3} } \\ = 0.9 \times {10}^{8 - 3} \\ = 0.9 \times {10}^{5} \\ = 9 \times {10}^{4}$

5 0

3 years ago

25 marble, 5 are red what pecent is that?

CaHeK987 [17]

Answer:

20%

Step-by-step explanation:

To find the decimal answer, we just do 5/25 which is equivalent to 0.2

Then, we multiply 0.2 by 100 to get the percentage:

0.2*100=20

8 0

3 years ago

Tisha has already written 2 pages, and she expects to write 2 pages for every additional hour spent writing. After spending 3 ho

professor190 [17]

Answer:

Step-by-step explanation:

x = 2n +2

where n is the number of hours. In this case n = 3 so x = 8

7 0

3 years ago

Read 2 more answers

For what value of k will the lines x+2y=0, 3x-4y-10=0 and 5x+ky-7=0 are concurrent?

konstantin123 [22]

Answer:

After solve the equations we get value of k=3

Step-by-step explanation:

We need to find value of k for which the lines x+2y=0, 3x-4y-10=0 and 5x+ky-7=0 are concurrent.

If the lines are concurrent, they pass through same point.

Let:

$x+2y=0--eq(1)\\ 3x-4y-10=0--eq(2)\\ 5x+ky-7=0--eq(3)$

First solving equation 1 and 2 to find values of x and y

From eq(1) we find value of x and put it in eq(2)

$From \ eq(1) x+2y=0\\x=-2y\\Put x=-2y \ in \ eq(2)\\3x-4y-10=0\\3(-2y)-4y-10=0 \\-6y-4y=10\\-10y=10\\y=\frac{10}{-10}\\y=-1$

After solving we get value of y=-1

Now putting in eq(1) to get value of x

$x+2y=0\\x+2(-1)=0\\x-2=0\\x=2$

So, Value of x= 2

Now put value of x=2 and y=-1 into eq(3) to find value of k

$5x+ky-7=0\\5(2)+k(-1)-7=0\\10-k-7=0\\-k+3=0\\-k=-3\\k=3$

So, After solve the equations we get value of k=3

4 0

3 years ago

William bought a piece of wood that is

Ivanshal [37]

Answer:

1 foot and 10 inches

Step-by-step explanation:

14 inches equals 1 foot and 2 inches.

3 feet

- 1 foot and 2 inches

= 1 foot and 10 inches

6 0

4 years ago

Read 2 more answers