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3 years ago

Prove or disprove: if p and q are prime numbers then pq - 2 is also a prime number.

Mathematics

1 answer:

jeyben [28]3 years ago

7 0

Counterexample:

$p=2\\ q=3\\\\ pq-2=2\cdot3-2=4$

4 is not a prime number. So, it's false.

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REY [17]

Answer:

A = 3

B = 1

C = 2

D = 10

E = 2

F = Not listed

G = 1

Step-by-step explanation:

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3 years ago

Find a function g for which g'(4)=g'(-8)=0

morpeh [17]

one correct answer is g(x)=0.

g'(4)=0 and g'(-8)=0

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3 years ago

Which of the following statements must be true about this diagram? Check all that apply.

Alik [6]

Answer:

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Step-by-step explanation:

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2 years ago

How many quarts of pure antifreeze must be added to 8 quarts of a 40% antifreeze solution to obtain a 60% antifreeze solution

anyanavicka [17]

Let q be the number of quarts of pure antifreeze that needs to be added to get the desired solution.

8 quarts of 40% solution contains 0.40 × 8 = 3.2 quarts of antifreeze.

The new solution would have a total volume of 8 + q quarts, and it would contain a total amount of 3.2 + q quarts of antifreeze. You want to end up with a concentration of 60% antifreeze, which means

(3.2 + q) / (8 + q) = 0.60

Solve for q :

3.2 + q = 0.60 (8 + q)

3.2 + q = 4.8 + 0.6q

0.4q = 1.6

q = 4

4 0

2 years ago

the ratio of the number of adults to the number of students at the prom has to be 1:10 lat year there were 477 more students tha

maksim [4K]

You would divide 10 into 477 to get 47.7, but you can't put 47.7 because you can't have a decimal. The answer is 47

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3 years ago