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ss7ja [257]
2 years ago
11

3r^2-8r-28=0 Solve with quadratic formula

Mathematics
2 answers:
sveticcg [70]2 years ago
8 0
R = 8 +- sqrt(64-4*3*-28) / 6

r = 8 +- sqrt(64--336) / 6

r = 8 +- sqrt(400) / 6

r = (8 +- 20) / 6

r = 14/3 or -2


mestny [16]2 years ago
5 0
(8 plus of minus radical 64 + 216
divided by 
6
(8 + or - 16.73320053)/6

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I really need help and this answered ASAP. thank you and sorry.
Semenov [28]

9514 1404 393

Answer:

  $2.50

Step-by-step explanation:

The question asks for the total cost of a notebook and pen together. We don't need to find their individual costs in order to answer the question.

Sometimes we get bored solving systems of equations in the usual ways. For this question, let's try this.

The first equation has one more notebook than pens. The second equation has 4 more notebooks than pens. If we subtract 4 times the first equation from the second, we should have equal numbers of notebooks and pens.

  (8n +4p) -4(3n +2p) = (16.00) -4(6.50)

  -4n -4p = -10.00 . . . . . . . . . . . simplify

  n + p = -10.00/-4 = 2.50 . . . . divide by the coefficient of (n+p)

The total cost for one notebook and one pen is $2.50.

__

<em>Additional comment</em>

The first equation has 1 more notebook than 2 (n+p) combinations, telling us that a notebook costs $6.50 -2(2.50) = $1.50. Then the pen is $2.50 -1.50 = $1.00.

One could solve for the costs of a notebook (n) and a pen (p) individually, then add them together to answer the question. We judge that to be more work.

4 0
3 years ago
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musickatia [10]
Maybe 34.5 !!!!!!!!!!!!!!
7 0
2 years ago
What is 27 divided by 1,581
quester [9]

Answer:

0.01707779886

Step-by-step explanation:

Just do 27/1581

6 0
3 years ago
1.
nikitadnepr [17]

Answer: 320 g

Step-by-step explanation:

We can set up a ratio.

Let the amount of oats equal to x.

18/240 = 24/x

We can now cross multiply.

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x = 320 g

4 0
2 years ago
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A forest covers 43,000 acres. A survey finds that 0.2% of the forest is old-growth trees. How many acres of old-growth trees are
Gelneren [198K]

Answer:

8,600 acres are old-growth trees.

Step-by-step explanation:

You can find this by multiplying the percentage by the overall number of acres

20% * 43,000 = 8,600

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3 years ago
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