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3 years ago

3a2 + 2a + 2a2 is equal to

Mathematics

2 answers:

nataly862011 [7]3 years ago

7 0

5a² + 2a

Step-by-step explanation:

$⇒ \: \rm 3 {a}^{2} + 2a + 2 {a}^{2}$

$⇒ \: \rm(3 + 2) {a}^{2} + 2a$

$\rm ⇒ \: 5 {a}^{2} + 2a$

yanalaym [24]3 years ago

4 0

Answer:

5a^2 +2a

Step-by-step explanation:

Like terms are ones with the same exponent of x. They can be combined.

3a^2 +2a +2a^2

= (3a^2 +2a^2) +2a

= (3+2)a^2 +2a

= 5a^2 +2a

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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)

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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

The function h(t) = 150 – 9t represents the height of a ball dropped from 150 feet after t seconds. What will the height of the

Alekssandra [29.7K]

After 1.4 seconds, t = 1.4.
h(t) = 150 - 9(1.4)
Multiply 9 by 1.4 to get 12.6.
h(t) = 150 - 12.6
Subtract 12.6 from 150 to get 137.4.
h(t) = 137.4.
The height of the ball would be 137.4 after 1.4 seconds.
Hope this helps!

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3 years ago

Hey,can you help me please i very need help..

Brut [27]

Answer:

4.71cm

Step-by-step explanation:

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3 years ago

For a school play, the teacher asked the class to set up chairs in 20 rows with 25 chairs in each row. After setting up all the

pantera1 [17]

20 rows * 25 chairs=500 chairs
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Answer=495