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3 years ago

“x” means what in math equations? I’m not the best at math :/

Mathematics

2 answers:

erastovalidia [21]3 years ago

6 0

The x is the missing variable.

tino4ka555 [31]3 years ago

4 0

Answer:

X is just the variable or missing edge, side, angle .etc that you are looking for

Step-by-step explanation:

You might be interested in

Will give brainliest

Galina-37 [17]

The percentage of the radioactive isotope left is 25.0000%.

The half life of a radioactive isotope is the time that will elapse before only half of the number of original isotopes will remain.

Now;

We are told that;

Half life (t1/2) = 55 days

Time taken (t) = 115 days

Ratio of isotope remaining = N/No

Thus;

N/No = (1/2)^t/t1/2

N/No = (1/2)^115/55

N/No = (1/2)^2

N/No =1/4

Hence, the percentage = 1/4 * 100/1 = 25.0000%

Learn more about half life of an isotope:brainly.com/question/16387602

#SPJ1

7 0

1 year ago

Nata [24]

Answer:

I tried looking it up, and i found 15 square units. sorry if its wrong :(

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

Dwayne drove 18 miles to the airport to pick up his father and then returned home. On the return trip he was able to drive an av

Nesterboy [21]

Answer:

30 mph

Step-by-step explanation:

Let d = distance (in miles)

Let t = time (in hours)

Let v = average speed driving to the airport (in mph)

⇒ v + 15 = average speed driving from the airport (in mph)

Using: distance = speed x time

$\implies t=\dfrac{d}{v}$

Create two equations for the journey to and from the airport, given that the distance one way is 18 miles:

$\implies t=\dfrac{18}{v} \ \ \textsf{and} \ \ t=\dfrac{18}{v+15}$

We are told that the total driving time is 1 hour, so the sum of these expressions equals 1 hour:

$\implies \dfrac{18}{v} +\dfrac{18}{v+15}=1$

Now all we have to do is solve the equation for v:

$\implies \dfrac{18(v+15)}{v(v+15)} +\dfrac{18v}{v(v+15)}=1$

$\implies \dfrac{18(v+15)+18v}{v(v+15)}=1$

$\implies 18(v+15)+18v=v(v+15)$

$\implies 18v+270+18v=v^2+15v$

$\implies v^2-21v-270=0$

$\implies (v-30)(v+9)=0$

$\implies v=30, v=-9$

As v is positive, v = 30 only

So the average speed driving to the airport was 30 mph

(and the average speed driving from the airport was 45 mph)

8 0

1 year ago

Read 2 more answers

There is a multiplication and division fact family with the numbers 2,4 and 8. Write the four fact family members

DanielleElmas [232]

Answer:

8-4=2

2 x 4=8

4 x 2=8

8-2=4

Step-by-step explanation:

6 0

3 years ago

62,400 is what percentage of 156,000

STatiana [176]

62400 is what percent of 156000
= 62400 / 156000 
= 0.4 

Converting decimal to a percentage: 
0.4 * 100 = 40%

5 0

3 years ago

Read 2 more answers