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
atroni [7]
2 years ago
14

Factor the expression. r^2 – 49 a. (r – 7)(r 9) b. (r 7)(r 7) c. (r – 7)(r 7) d. (r – 7)(r – 7)

Mathematics
1 answer:
gayaneshka [121]2 years ago
6 0
r^2-49=r^2-7^2\\\\/use\ a^2-b^2=(a-b)(a+b)/\\\\=\boxed{(r-7)(r+7)}
You might be interested in
What is 220% of 400? A. 88 B. 880 C. 8,800 D. 88,000
Andrews [41]

Answer:

The correct answer is B. 880

Step-by-step explanation:

220%=2.2

2.2(400)=880

7 0
3 years ago
Read 2 more answers
The expression 4 square root of 81^3 can be rewritten as_____.
rodikova [14]
Its is d                                                                                    the answer is d idk why this thing makes type more then what i need tro type
5 0
3 years ago
Petra made the following observation:
AleksandrR [38]

Answer:A ratio compares two numbers or two quantities that are measured with the same unit. The ratio of a to b is written a to b,ab,ora:b. ... When a ratio is written in fraction form, the fraction should be simplified. If it is an improper fraction, we do not change it to a mixed number.

Step-by-step explanation:

A ratio compares two numbers or two quantities that are measured with the same unit. The ratio of a to b is written a to b,ab,ora:b. ... When a ratio is written in fraction form, the fraction should be simplified. If it is an improper fraction, we do not change it to a mixed number.

3 0
3 years ago
english has 26 different letters. how many consecutive words have to be selected in a book to have at least 5 that start with th
Valentin [98]

The words need not be English language words  142506

What is permutation and combination?

A set of elements can be divided into subsets in two different ways: combination and permutation.

                          The components of the subset may be arranged in any order when combined. The components of the subset are listed in a permutation in a certain order.

If the word has 5 different letters  then it is just 26-choose-5 or (26/5).

If the word has 4 different letters  then it is just 26-choose-4 or (26/4)

have 4 options to choose which letter to duplicate twice.

This gives =  4*(26/4)

If the word has 3 different letters  then it is just 26-choose-3 or (26/3).

you duplicate one of the three letters 3 times - 3 options for that, or you choose 2 letters and duplicate each one twice - again 3 options. In total this gives  = 6*(26/3).

If the word has 2 different letters  then it is just 26-choose-2 or (26/2).

The sets of 2 different letters and duplicate either one of the letters 4 times - 2 options; or duplicate one letter 2 times, and the other 3 times - again 2 options. In total this is  = 4*(26/2).

The word has just 1 distinct letter you have =  (26/1).

we get :

N = (26/5)+ 4*(26/4) + 6*(26/3) + 4*(26/2) +  (26/1)

= 142506

The words need not be English language words  = 142506

Learn more about  permutation and combination

brainly.com/question/28065038

#SPJ4

5 0
1 year ago
Can I please get some help on this question ?
Vikki [24]

Answer: 15 Units

Step-by-step explanation:

Im smart

8 0
2 years ago
Read 2 more answers
Other questions:
  • What are the factors of 27
    14·1 answer
  • The area of a rectangle is 135 square feet. The width is 6 feet less than the length. Find the dimensions of the rectangle
    7·1 answer
  • A swimming pool is in the shape of a rectangular prism. It measures 15 feet by 12 feet by 8 feet. How many cubic feet of water a
    15·2 answers
  • Identify the coordinates of the midpoint of AD, which has endpoints A(3,−2) and D(−5,4).
    5·1 answer
  • 142% as a mixed numer in simplest form
    13·2 answers
  • Patrick bought a new fish and a cube shape tank for it. If the tank has a height of 17 inches, how much water will Patrick need
    8·2 answers
  • Help me pls with this​
    5·1 answer
  • A chemical solution contains 4% alcohol. If there is 24 ml of alcohol, what is the volume of the solution?
    14·1 answer
  • Pls help im confused with this
    11·1 answer
  • During a one-year time period, how many gallons of water would the average household save by using an efficiency washer vs a reg
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!