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2 years ago

Explain why x=4 is not in the domain of the function f(x)=√x-5 ?

Mathematics

1 answer:

lianna [129]2 years ago

6 0

Since we are dealing with a radical then x - 5 ≥ 0, for real values

x = 4 is less than 5 , hence is not in the domain

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The length of a tunnel is 450 miles. On a map of the tunnel, 1 inch represents 60 miles. What is the length of the tunnel on the

Ierofanga [76]

Answer:

7.5 is the blank

Step-by-step explanation:

1 in = 60 m

? in 450 m

450÷60 = ? in

7.5 in = ?

Therefore the length of the tunnel on the map is 7.5 inches

5 0

2 years ago

Can you help me solve these questions....please and thank you!

FromTheMoon [43]

42)
prime numbers are 41, 43, 47
answer
F. 3

35)
36 colored
faction 36/60 = 18/30 = 6/10 = 3/5

faction not equivalent to is 8/20

answer is C. 8/20

11)
answer is D. 18.21

cause 18.21 > 17.06 and 18.21 < 18.307

5 0

3 years ago

PLEASE HELP!!! GIVING BRAINLIEST!! ill also answer questions that you have posted if you answer this correctly!!!! (80pts)

wariber [46]

Answer:

PQ = 20

QR = 15

Step-by-step explanation:

PQ^2 = 16^2 + 12^2

PQ^2 = 400

PQ = √400 = 20

QR^2 = 12^2+9^2

QR^2 = 225

QR = √225 = 15

6 0

3 years ago

Read 2 more answers

Given the equation y = 3x − 4, what is the value of y when x = 4?

Marat540 [252]

Answer:

C) 8

Step-by-step explanation:

y=3*4-4

y=12-4

y=8

5 0

3 years ago

Estimate the solution to the system of equations 7x−y=7 x+2y=6 i need help

Yanka [14]

Answer:

(4/3, 7/3)

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Equality Properties

Multiplication Property of Equality
Division Property of Equality
Addition Property of Equality
Subtraction Property of Equality

Algebra I

Terms/Coefficients
Coordinates (x, y)
Solving systems of equations of using substitution/elimination

Step-by-step explanation:

Step 1: Define Systems

7x - y = 7

x + 2y = 6

Step 2: Rewrite Systems

Equation: x + 2y = 6

[Subtraction Property of Equality] Subtract 2y on both sides: x = 6 - 2y

Step 3: Redefine Systems

7x - y = 7

x = 6 - 2y

Step 4: Solve for y

Substitution

Substitute in x: 7(6 - 2y) - y = 7
Distribute 7: 42 - 14y - y = 7
Combine like terms: 42 - 15y = 7
[Subtraction Property of Equality] Subtract 42 on both sides: -15y = -35
[Division Property of Equality] Divide -15 on both sides: y = 7/3

Step 5: Solve for x

Define original equation: x + 2y = 6
Substitute in y: x + 2(7/3) = 6
Multiply: x + 14/3 = 6
[Subtraction Property of Equality] Subtract 14/3 on both sides: x = 4/3

7 0

3 years ago