1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Vaselesa [24]
3 years ago
5

9. Determine whether or not the number 257 is prime.

Mathematics
1 answer:
Sladkaya [172]3 years ago
7 0

Answer:

257 is prime.

Step-by-step explanation:

To evaluate if a number is prime, we just need to evaluate it for the prime numbers that are equal or lesser than the said number's square root.

In this case, √257 = 16.03 so we just need to see if 257 is divisible by <u>2, 3, 5, 7, 11 and 13</u> (the prime numbers that come before 16)

  • 257 is odd, so it is not divisible by 2.
  • The sum of its digits is 14, therefore, it is not divisible by 3.
  • 257 ends in 7, therefore it's not divisible by 5.
  • 257/ 7 = 36.71 so it's not divisible by 7.
  • 257/ 11 = 23.36 so it's not divisible by 11
  • Finally 257 / 13= 19.76 so it's not divisible by 13.

Therefore, 257 is prime.

You might be interested in
Please help, I've tried learning this multiple times but just can't get it down
Sladkaya [172]
1) n times n times n times n times n times n

2) n^6

Brainliest?
3 0
3 years ago
A section in a stained glass window is shaped like a trapezoid. The top base is 2 centimeters and the bottom base is 4.5 centime
Elza [17]

Answer:

2.8 cm

Step-by-step explanation:

The area of a trapezoid is calculated using the formula:

A=\frac{(B+b)h}{2}

where

B is the length of the major base

b is the length of the minor base

h is the height of the trapezoid

In this problem, the glass window has the shape of a trapezoid. We know that:

B = 2 cm is the length of the top base

b = 4.5 cm is the length of the bottom base

A=9.1 cm^2 is the area of the trapezoid

Solving for h, we can find the height of the stained glass window:

h=\frac{2A}{B+b}=\frac{2(9.1)}{2+4.5}=2.8 cm

8 0
3 years ago
PLEASEEE HELP -7a + 2b
Y_Kistochka [10]

Answer:

There are no like terms.

so its -7a+2b

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Which of the following is a counterexample to the statement “All freshman girls are going to the dance”?
Feliz [49]
A counterexample is an example which opposes an idea. The idea that all freshman girls are going to the dance can be opposed by saying that one of them will not be going. If one out of a group does not go to the dance, then the statement that all of these girl types are going would be a false statement. Most of the freshman girls will be going, aside from one. Roberta is causing problems for this statement. You'd better tell her to straighten her act up!
7 0
4 years ago
Solve three-fourths b minus one-sixth equals one-half for b
Snowcat [4.5K]
3/4b-1/6=1/2×b
1.75b=.3
b=0.2
I believe this is right. But not 100%
7 0
3 years ago
Other questions:
  • -4y=-20x+40<br> y+10=5x
    8·1 answer
  • What is the value of 3.5 (11) + 1.9 (11) + 1.6 (11)?What is the value of 20 + 3 (7 + 4) + 5 + 2 (7 + 9)?
    11·1 answer
  • ericas mother saved her quarters and dimes .she counted 48 coins with a value of $7.50.how many quarters and dimes were there?
    15·2 answers
  • One high speed Internet provider has a $39 setup fee and charges $40 per month. Another
    12·1 answer
  • Two similar solids have edges of 12 feet and 24 feet. If the smaller
    8·1 answer
  • 3456 ÷ 42<br><br>(show your work)​
    15·1 answer
  • Correctly factor the expression 15a-6b+36 using the greatest common factors
    7·1 answer
  • Plz help. One winter day, the temperature in Houston is 12 degrees Celsius. Find the temperatures in these other cities.
    6·1 answer
  • –4(5x) please please please
    10·2 answers
  • Write a linear function that passes through the points (3, -7) and (0, 15)
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!