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MAVERICK [17]
3 years ago
10

What does a letter with a line over it mean

Mathematics
1 answer:
Helga [31]3 years ago
7 0

Step-by-step explanation:

The line above the letter means "complement". If X is a set, the the complement of X (denoted by X with a line above it) is the set of all things not in X...If X is a set, then the complement of X (denoted by X with a line above it) is the set of all things not in X.

Sorry if it was complicated

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25 points+brainliest!
STatiana [176]

Answer:

an= 10n+90

a10= 190

8 0
3 years ago
Read 2 more answers
Find the sum of first 20 to terms of an ap in which d is equal to 7 and 20 second term is 149​
GuDViN [60]

Answer:

1370

Step-by-step explanation:

<h3>Given</h3>
  • AP with d= 7 and a₂₂ = 149
<h3>To find</h3>
  • Sum of first 20 terms
<h3>Solution</h3>

<u>First, let's get the value of the first term:</u>

  • aₙ = a + (n-1)d
  • a₂₂ = a + 21d
  • 149 = a + 21*7
  • a = 149 - 147
  • a= 2

<u>Next, let's find the sum of the first 20 terms</u>

  • Sₙ = 1/2n(2a+ (n-1)d)
  • S₂₀ = 1/2*20(2*2 + 19*7) = 10(4 + 133) = 10*137 = 1370

<u>Answer is</u> 1370

6 0
3 years ago
Read 2 more answers
A bookstore classifies its books by reader group, type of book, and cost. What is the probability that a book selected at random
Alina [70]

Answer:

A) 315/1005

Explanation:

Total choices: 120 + 255 + 35 + 60 + 200 + 110 + 75 + 150 = 1005

Favorable choices: 255 + 60 = 315

probability:

favorable choices/total choices

315/1005

21/67

3 0
2 years ago
_16. Which expression is equivalent to
Phantasy [73]

Answer:

-2x-8

Step-by-step explanation:

1) Distribute:

-6/3x+-15/3-3

2) Simplify:

-2x-5-3

3) combine like terms:

-2x-8

hope this helps

5 0
3 years ago
An unknown number x is at most 10. Which graph best represents all the values of x?
barxatty [35]

Answer:

The Answer is D Number line graph with closed circle on 10 and shading to the left. I took the test and got it right.

a number is at most 10 so it could be ten so it is a closed circle. it is shading to the left because no more than than ten

7 0
3 years ago
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