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kolbaska11 [484]
3 years ago
9

If f(x)= 2x^2 +5, find f(-2)

Mathematics
2 answers:
kaheart [24]3 years ago
5 0
Use the magic napkin

kherson [118]3 years ago
3 0
The answer would be 13. You just replace the "x" with "-2" so the equation will look like f(-2) = 2(-2)^2+5. Which all comes out to 13.
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In a pile of coins there are 7 more quarters than nickels. If there is a total of$2.65 in coins, how many quarters are there?
Alinara [238K]
<span>A quarter is equivalent to 25 cents or $0.25 and a nickel is equal to 5 cents or $0.05. In the given in this item, if there are x nickels then, there are x + 7 quarters. With these and the total amount known, we can now compute for the value of x.
                 (x)(0.05) + (x + 7)(0.25) = 2.65
 Simplifying,
             0.05x + 0.25x + 1.75 = 2.65
 Simplifying further,
                0.3x = 0.9
 The value of x from the equation is 3. Hence, there are 10 quarters.</span>
6 0
3 years ago
Read 2 more answers
What is the solution of 5y + 1=31
gayaneshka [121]

Answer:

y=6

Step-by-step explanation:

edge2020

4 0
3 years ago
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Find all pairs of prime numbers (a,b) such that a^b✖️b^a+1 is prime
Alenkasestr [34]

The pairs of prime numbers (a,b) between 1 and 10 inclusive such that a^b * b^a+1 is prime are

<h3>How to determine the pairs of numbers?</h3>

The expression that is a prime number is given as:

a^b * b^a + 1

The boundary or range of numbers of a and b is not given.

So, we make use of numbers between 1 and 10

i.e. 1 ≤ a ≤ 10 and 1 ≤ b ≤ 10

Using the above range, we have the following program to determine the pairs of prime numbers (a, b).

for a in range(1,11):

   for b in range(1,11):

       num = (a* *b) * (b* *a) + 1

       flg = False

       if num > 1:

           for i in ra nge(2, num):

               if (num % i) == 0:

                   flg = True

                   break

       if not flg:

           print(str(a)+","+str(b))

The output of the above program is:

(1,1), (1,2), (1,4), (1,6), (1,10), (2,1), (2,2), (2,3), (2,4), (3,2), (4,1), (4,2), (4,4) and (4,6)

The above represent all pairs of prime numbers (a,b) such that a^b * b^a+1 is prime

Read more about prime numbers at:

brainly.com/question/25710806

#SPJ1

5 0
2 years ago
Explain the difference between 1/2 and 1/2%
Gnoma [55]

But the correct usage is that 1:2 means a ratio of 1 to 2, meaning 1 part of something and 2 parts of something else (not out of 2 parts total) ...

5 0
2 years ago
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What if you quadruple the radius of a circle. What happens to the circumference? Explain using examples.
Stells [14]

Step-by-step explanation:

Let's check

  • Let radius be x

Circumference:-

➜2πr

➜<u>2πx</u>

  • New radius=3x

New Circumference:-

➜2πr

➜2π3x

➜6πx

<u>Takin</u><u>g</u><u> </u><u>ratio</u><u>:</u><u>-</u>

➜2πx/6πx

➜1/3

➜1:3

<h3>Thus,</h3>

If we quadruple the radius Circumference will also be quadrupled.

7 0
3 years ago
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