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salantis [7]
3 years ago
11

Estimate a 15% tip for a $26.40 restaurant bill

Mathematics
1 answer:
olchik [2.2K]3 years ago
7 0

Answer:

$4.00

Step-by-step explanation:

because 15% of 26.40 is 3.96 which is closest to $4.00

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Find the number, if 2.5 of it is 0.75
garri49 [273]

Step-by-step explanation:

Let number be X

Therefore 2.5 of X = 0.75

X = 0.75/2.5

= 0.3

8 0
3 years ago
Prove that there are infinitely many primes of the form 4k + 3, where k is a non-negative integer. [Hint: Suppose that there are
Simora [160]

Answer:

The prove is as given below

Step-by-step explanation:

Suppose there are only finitely many primes of the form 4k + 3, say {p1, . . . , pk}. Let P denote their product.

Suppose k is even. Then P ≅ 3^k (mod 4) = 9^k/2 (mod 4) = 1 (mod 4).

ThenP + 2 ≅3 (mod 4), has to have a prime factor of the form 4k + 3. But pₓ≠P + 2 for all 1 ≤ i ≤ k as pₓ| P and pₓ≠2. This is a contradiction.

Suppose k is odd. Then P ≅ 3^k (mod 4) = 9^k/2 (mod 4) = 1 (mod 4).

Then P + 4 ≅3 (mod 4), has to have a prime factor of the form 4k + 3. But pₓ≠P + 4 for all 1 ≤ i ≤ k as pₓ| P and pₓ≠4. This is a contradiction.

So this indicates that there are infinite prime numbers of the form 4k+3.

6 0
3 years ago
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2 2/5% as a fraction
fiasKO [112]

Answer:

3/125

Step-by-step explanation:

2 2/5 divided by 100

12/5 divided by 100

equals 3/125

6 0
3 years ago
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Like terms 4x + 2x + 7x
nasty-shy [4]
Since the 3 of them are like terms, we have to ADD all 3 of them.

4x+2x+7x= 13x
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3 years ago
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What is twenty six million four hundred five thousand twenty in standard form?
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Answer:

26,405,020

Step-by-step explanation:

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3 years ago
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