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3 years ago

What’s are prime numbers

2 answers:

8 0

Step-by-step explanation:A cardiologist is a doctor with special training and skill in finding, treating and preventing diseases of the heart and blood vessels

Answer:

A prime number is a whole number greater than 1 whose only factors are 1 and itself. The first few prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23 and 29

lesya [120]3 years ago

4 0

Answer: a prime number is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers.

Step-by-step explanation:

For example, 5 is a prime because the only ways of writing it as a product, 1 x 5 or 5 x 1, involve five itself

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The excursion boat on the river takes 2½ hours to make the trip to a point 12 miles upstream and to return. If the rate at which

Orlov [11]

Answer:

2 mph

Step-by-step explanation:

time = distance / speed

Let c represent the rate of the current. Then the upstream rate of the boat relative to the shore is (5c -c) = 4c, and the upstream time is ...

... 12/(4c) = 3/c.

Likewise, the downstream rate is (5c +c) = 6c, and the downstream time is ...

... 12/(6c) = 2/c.

The total time is the sum of upstream and downstream times:

... 3/c +2/c = 2.5

... 5/c = 2.5 . . . . . . combine terms

... 5/2.5 = c = 2 . . . multiply by c/2.5

6 0

3 years ago

Help me with this!! I dont understand this question

Alecsey [184]

Answer:

Basically, it is asking, of the 4 expressions given, which one is true?

"C" is the answer.

9 (3r -4) when multiplied equals 27r -36

Step-by-step explanation:

7 0

3 years ago

The exponent indicates how many times the ......... is used as a factor

Dimas [21]

Base or base number
for example 2^3 = 2 * 2 * 2 or x^2 = x * x

7 0

4 years ago

Saturday, nola bowled 3 games in her bowling league. she had a mean score of 115. the score of her first game was 110. the score

Elina [12.6K]

110+90+145=345
345 divided by 3=115

so the score of her third game was 145 points.
hope i helped! :)
please rate brainliest!

7 0

3 years ago

Read 2 more answers

Solve the equation: k^2+5k+13=0

mr_godi [17]

Step-by-step explanation:

k² + 5k + 13 = 0

Using the quadratic formula which is

$x = \frac{ - b \pm \sqrt{ {b}^{2} - 4ac } }{2a} \\$

From the question

a = 1 , b = 5 , c = 13

So we have

$k = \frac{ - 5 \pm \sqrt{ {5}^{2} - 4(1)(13) } }{2(1)} \\ = \frac{ - 5 \pm \sqrt{25 - 52} }{2} \\ = \frac{ - 5 \pm \sqrt{ - 27} }{2} \: \: \: \: \: \: \\ = \frac{ - 5 \pm3 \sqrt{3} \: i}{2} \: \: \: \: \: \:$

Separate the solutions

$k_1 = \frac{ - 5 + 3 \sqrt{3} \: i }{2} \: \: \: \: or \\ k_2 = \frac{ - 5 - 3 \sqrt{3} \: i}{2}$

The equation has complex roots

Separate the real and imaginary parts

We have the final answer as

$k_1 = - \frac{5}{2} + \frac{3 \sqrt{3} }{2} \: i \: \: \: \: or \\ k_2 = - \frac{5}{2} - \frac{3 \sqrt{3} }{2} \: i$

Hope this helps you

8 0

3 years ago