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irinina [24]
3 years ago
12

Name two different numbers that round to 30 when rounded to the nearest ten.

Mathematics
1 answer:
AlexFokin [52]3 years ago
4 0
If you have 9.9 that rounds to 10, then if you have 19.9 then that rounds to 20. And 20+10=30.
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Twice the sum of three and a number is 30. Find the number
DedPeter [7]

9514 1404 393

Answer:

  • 2(x +3) = 30
  • 12

Step-by-step explanation:

When x represents the number, "the sum of 3 and a number" is (x+3). Twice that sum is 2(x+3). "Is 30" means this expression is equal to 30:

  2(x +3) = 30 . . . . an equation for the given conditions

__

We can solve this equation by dividing by 2:

  x + 3 = 15

  x = 12 . . . . . . subtract 3

The number is 12.

5 0
3 years ago
Researchers wanted to see which species of lizard (A, B, or C) is most likely to survive a bacterial infection. So they infected
Slav-nsk [51]

Answer:

A) attached below

B) 0.61

C) 0.47

Step-by-step explanation:

Given data:

Total number of lizards infected = 38

Of the 15 species B lizards 40% survived

For specie C one more survived than died

Out of the 24 lizards that died 1/3 were species A

<u>A) contingency table </u>

attached below

<u>B) Determine the proportion of these lizards in this study that were either specie A or Specie B </u>

P ( A or B ) = ( 8 + 15 ) / 38 = 0.605 ≈ 0.61

<u>C) determine the probability that specie C lizard did not study </u>

P ( not surviving  | C ) = 7 / 15 = 0.466 ≈ 0.47

7 0
3 years ago
How would you find the width of a golden rectangle if your givin the length?
Nesterboy [21]
A golden rectangle is a rectangle whose length and width follow the golden ratio (about 1:1.618).

Given the length, you would divide by 1.618 to find the width.

Edit: The exact value is \frac{  1+\sqrt{5} }{2}, but 1.618 should suffice. 
5 0
4 years ago
Someone pls help me with this I will make you brain
strojnjashka [21]
I think it is the second one
The slope is 2, because there is $20 difference
I hope this helps :)
If you have any questions about my answer please feel free to ask:)
7 0
3 years ago
Can someone help me with this question please?
myrzilka [38]

Answer:

x=-3

Step-by-step explanation:

8 0
4 years ago
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