PLEASE HELP ITS URGENT!

Answers

Answer 1

Answer:

Answer:

which one 3 or 4. please tell me

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Choose the correct product of (9x − 5)(9x + 5).81x2 + 90x + 25
81x2 − 25
81x2 + 25
81x2 − 90x + 25

Answers

Hi,
(a+b)(a-b=a²-b²
Thus (9x)²-5²=81x²-25

Answer:

The Answer is B

Step-by-step explanation:

(9x−5)(9x+5)

=(9x+−5)(9x+5)

=(9x)(9x)+(9x)(5)+(−5)(9x)+(−5)(5)

=81x2+45x−45x−25

=81x2−25

The length of a rectangle is 3n+ 2 and its width is n-1. The perimeter of the rectangle is twice the sum of its length and its width. write an expression that represents the perimeter of the rectangle. Find the perimeter of the rectangle when n= 4 inches

Answers

Length, L = 3n + 2
Width, W = n - 1

Perimeter, P = 2*(L + W)

   = 2*( 3n + 2 + n - 1)

   = 2*(3n + n + 2 - 1)

   = 2*(4n + 1)

   = 2*4n + 2*1

   = 8n + 2

Perimeter = (8n + 2)

Perimeter, when n = 4, 8n + 2 = 8*4 + 2 = 32 +2 = 34

Perimeter = 34 inches.

How many points of intersection will the following system of linear equations have? y = 9x, 3y = -3x - 5 a) 0 b) 1 c) 2 d) Infinite

Answers

Answer:

Step-by-step explanation:

given the system of equations

y = 9x → (1)

3y = - 3x - 5 → (2)

substitute y = 9x into (2)

3(9x) = - 3x - 5

27x = - 3x - 5 ( add 3x to both sides )

30x = - 5 (divide both sides by 30 )

x = - $(5)/(30)$ = - $(1)/(6)$

substitute x = - $(1)/(6)$ into (1) and solve for y

y = 9x = 9 × - $(1)/(6)$ = - $(9)/(6)$ = - $(3)/(2)$

point of intersection = ( - $(1)/(6)$ , - $(3)/(2)$ )

A password is 4 characters long and must consist of 3 letters and 1 of 10 special characters. If letters can be repeated and the special character is at the end of the password, how many possibilities are there? a. 175,760
b. 456,976
c. 703,040
d. 1,679,616

Answers

Hello,
number of letters:26
In each 3 first position ,we can put 26 possibilities
=>26^3
Last position: 10 posibilities

==>26^3*10 =175 760
Answer A

Using the Fundamental Counting Theorem, it is found that the number of possibilities is given by:

a. 175,760

What is the Fundamental Counting Theorem?

It is a theorem that states that if there are n things, each with $n_1, n_2, \cdots, n_n$ ways to be done, each thing independent of the other, the number of ways they can be done is: