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3 years ago

The value of y varies directly with x. When y = 7, x = 2. what is the value of x when y is 21?

Mathematics

1 answer:

mrs_skeptik [129]3 years ago

8 0

Y=kx
7=k(2)
k=7/2

y=kx
21=7/2(x)
x=6

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2. Find the area and circumference of the circle to the right.<br>16.6 m<br>

adoni [48]

Answer:

AREA:

$A=216.42m^2$

CIRCUMFERENCE:

$C=52.15m$

Step-by-step explanation:

The formula that is used to calculate the area of a circle is:

$A=\pi r^2$

Where "r" is the radius of the circle.

The formula for calculate the circumference of a circle is:

$C=2\pi r$

Where "r" is the radius of the circle.

Then, you need to find the radius. This is:

$r=\frac{16.6m}{2}=8.3m$

Substituting the radius, you get that the area and the circumference are:

AREA:

$A=\pi (8.3m)^2=216.42m^2$

CIRCUMFERENCE:

$C=2\pi (8.3m)=52.15m$

7 0

3 years ago

Read 2 more answers

Please help with 2 questions. Thank you.

8_murik_8 [283]

${e}^{ln(anything)} = anything$

so here we have:

${e}^{ln1} = 1$

${e}^{ln5x} = 5x$

8 0

3 years ago

Hannah is showing her work in simplifying (6.1 − 4.5) − 2.5 + 3.9. Identify any error in her work or reasoning.

pishuonlain [190]

Answer:

pretty sure she did something wrong in the 1st step, it specifically said to do 6.1-4.5, but she changed the parathenesis, resulting in a different answer

6 0

2 years ago

Plz anyone help

777dan777 [17]

Answer: the answer should be 52

Step-by-step explanation:

All I’d did is 20-32-40=52

4 0

2 years ago

Suppose that there are two types of tickets to a show: advance and same-day. The combined cost of one advance ticket and one sam

weeeeeb [17]

Let there be a advanced tickets and s same day tickets, Then:-

a + s = 40

20a + 30s = 950............................(1)

Multiply first equation by -30

-30a - 30x = -1200 .....................(2)

Adding equations (1) and (2):-

-10a = - 250

a = -250/-10 = 25

So s = 40 - 25 = 15

Answer:- advanced tickets cost $25 and same day cost $15.

8 0

3 years ago