3 years ago

Please help me with this problem

Mathematics

1 answer:

Julli [10]3 years ago

4 0

The answer is A i believe so cause its adding 4 seats every time and you multiply 4*21

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Which of the following is a solution for the equation 7x+ 21 = 105? 105 15 84 12

lisov135 [29]

The correct answer is 12

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3 years ago

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What does 2 1/4 - 1 2/3?

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Look at pic and solve

Brilliant_brown [7]

Answer:

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Step-by-step explanation:

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3 years ago

What is the solution of the equation when solved using the quadratic formula?<img src="https://tex.z-dn.net/?f=x%5E%7B2%7D%20%2B

Artemon [7]

Answer:

$x=\pm2i\sqrt{5}$

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Algebra I

Standard Form: ax² + bx + c = 0
Quadratic Formula: $x=\frac{-b\pm\sqrt{b^2-4ac} }{2a}$

Algebra II

Imaginary Numbers: √-1 = i

Step-by-step explanation:

Step 1: Define Equation

x² + 20 = 0

Step 2: Identify Variables

a = 1

b = 0

c = 20

Step 3: Find roots x

Substitute: $x=\frac{-0\pm\sqrt{0^2-4(1)(20)} }{2(1)}$
Exponents: $x=\frac{-0\pm\sqrt{0-4(1)(20)} }{2(1)}$
Multiply: $x=\frac{-0\pm\sqrt{0-80} }{2}$
Subtract: $x=\frac{\pm\sqrt{-80} }{2}$
Factor: $x=\frac{\pm\sqrt{-1} \sqrt{80} }{2}$
Simplify: $x=\frac{\pm4i\sqrt{5} }{2}$
Divide: $x=\pm2i\sqrt{5}$

6 0

2 years ago

A geometry class has a total of 27 students. The number of females is 13 less than the number of males. How many males and how m

Zanzabum

Answer:

20 males, 7 females

Step-by-step explanation:

x=males

x-13=females

x+x-13=27

2x-13=27

2x=40

x=20

20-13=7

6 0

3 years ago