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3 years ago

4) FRIDAY: An unknown quantity which is represented by a letter or a symbol is called _____

Mathematics

1 answer:

lukranit [14]3 years ago

8 0

Answer:

A Variable

Step-by-step explanation:

Variables are used to mark an unknown value. Common math problems ask you to solve for it.

For example in 5x+23=45, 'x' is the variable.

A constant is a number without a variable.

<em>Brainilest Appreciated. </em>

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An atom of a certain element has 37 protons, 37 electrons, and a mass number of 85. How many neutrons are

Harrizon [31]

Answer:

There will be 48 neutrons.

Step-by-step explanation:

Hope this helps and have a great day :)

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3 years ago

g Bonus: Assume that among the general pediatric population, 7 children out of every 1000 have DIPG (Diffuse Intrinsic Pontine G

patriot [66]

Answer:

0.9586

Step-by-step explanation:

From the information given:

7 children out of every 1000 children suffer from DIPG

A screening test designed contains 98% sensitivity & 84% specificity.

Now, from above:

The probability that the children have DIPG is:

$\mathbf{P(positive) = P(positive \ | \ DIPG) \times P(DIPG) + P(positive \ | \ not \DIPG)\times P(not \ DIPG)}$ $= 0.98\imes( \dfrac{7}{1000}) + (1-0.84) \times (1 - \dfrac{7}{1000})$

= (0.98 × 0.007) + 0.16( 1 - 0.007)

= 0.16574

So, the probability of not having DIPG now is:

$P(not \ DIPG \ | \ positive) = \dfrac{ P(positive \ | \ not DIPG)\timesP(not \ DIPG)} { P(positive)}$

$=\dfrac{ (1-0.84)\times (1 - \dfrac{7}{1000}) }{ 0.16574}$

$=\dfrac{ 0.16 ( 1 - 0.007) }{0.16574}$

= 0.9586

8 0

3 years ago

Tina left for school at 8:35 a.m. and she got back home at 3:45 p.m. How long was

a_sh-v [17]

Answer:

430 minutes or 7 hours and 10 minutes

Step-by-step explanation:

From 8:35 am to 9 am is 25 minutes. There are 60 minutes in an hour and 9 am to 3 pm is 6 hours. 3:00 to 3:45 pm is an additional 45 minutes.

60 minutes x 6 hours = 360 minutes

360 + 25 + 45 = 430 minutes

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2 years ago

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4 + x = 12 solve equation ///ASAP /// WILL MARK BRAINLIEST

Bess [88]

Answer:

Answer is 8.

Step-by-step explanation: 12-4=8 so 4+8=12

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3 years ago

Bernardo graphed the amount of money he earned each week mowing lawns. A line graph titled Lawn Mowing Money has weeks on the x-

Sati [7]

Answer:

My answer was deleted but it was between 4 and 6 weeks

Step-by-step explanation:

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3 years ago

Read 2 more answers