which of the following group of numbers are all prime numbers a.2,5,15,19 b.7,17,29,49 c.3,11,23,31 d.2,3,5,9,

Answers

Answer 1

Answer: Prime numbers are those that cannot be divided by another number (other than themselves and 1). In other words, prime numbers have factors of themselves and 1.

For example, 3 is a prime number because its only factors are 3 and 1.

6 is not a prime number because it can be factored to 3*2.

Therefore, the correct answer is c. 3,11,23,31

Answer 2

Answer: Prime numbers can only be divided by 1 and itself.

First group:- It contains 15, and 15 can be divided by 3 and 5 to get a whole number.

Second group:- 49 can be divided by 7 to receive 7. So this is wrong.

Third group:- This group can be considered all prime numbers, so this is correct.

Fourth group:- Incorrect. Because 9/3 = 3

Answer:- c. 3,11,23,31 are all prime numbers.

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Simplify. (-6x^2 + 2y - 1) + (2x^2-5y + 3) A) -4x^2 + 3y -2 B) -4x^2 - 3y - 2 C) -4x^2 + 3y +2 D) -4x^2 -3y +2

Answers

Combine like terms

-6x^2+2y + -1 +2x^2 + -5y +3

( -6x^2+2x^2)+(2y-5y)+(-1+3)

= -4x^2+3y+2

Answer : C

I hope that's help !

In a certain class, 40% of the students are girls, and 20% of the girls wear glasses.What percent of the children in the class are girls who wear glasses?

Answers

answer is 8%

(0.40)*(0.20) = 0.08 multiply by 100 to determine percent = 8% of the class are girls who wear glasses

Answer:

20%

Step-by-step explanation:

hehe idk i just wanted some points

If im making 8.25 an hour 30 hours a week how much would i make after taxes in Florida? I think the taxes are 6.2 %

Answers

If you were to earn that for 30 hours after taxes, you'd earn in total about $230.

6.A farmer who only sells produce to local residents in his town wishes to expand to a neighboring city. The farmer calls everyone in the phonebook with a last name starting with "S" in the neighboring city and asks them if they would be interested in buying the produce. 242 told the farmer that they would be interested, 576 said they would not be interested and 138 refused to answer. Which statement is true?

The survey sample includes current customers.

The population of the survey includes everyone the farmer called.

The population of the survey is all residents of the neighboring city whose phone number is listed.

The survey sample includes residents of the neighboring city whose phone number is listed.

Answers

Answer: The population of the survey includes everyone the farmer called.

Step-by-step explanation:

Xian and his cousin Kai both collect stamps, and Kai has 68 stamps. The boys recently joined different stamp collecting clubs. Xian’s club sill send him 12 new stamps per month. Kai’s club will send him 8 new stamps per month. After how many months will Xian and Kai have the same number of stamps? How many stamps will each have?

Answers

Assuming that Xian starts with 0 stamps, you set the equations equal to each other to find what month they have the same amount of stamps.

(68 from Kai's original stamps) (8 from how many per month)
(0 from Xian's original stamps) (12 from how many per month)
68+8m=0+12m
solve for m in this equation and you get 68=4m
and 68/4 = 17 months

For how many stamps each will have, you plug in 17 into m in Xian's equation (you could do either but Xian's is easier):
0+12m
0+12(17)=204
204 stamps.

Hope this helped, it was kinda long lol

If 3t − 7 = 5t , then 6t = how do you solve this

Answers

$3t-7=5t \ \ \ |\hbox{subtract 3t} \n -7=5t-3t \n -7=2t \ \ \ |\hbox{multiply by 3} \n \boxed{6t=-21}}$

$3t-7=5t\n5t-3t=-7\n2t=-7|\cdot3\n\boxed{6t=-21}$

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