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3 years ago

4x + 9 = 2x + 15 .. I need help

Mathematics

1 answer:

valkas [14]3 years ago

3 0

Answer:

x = 3

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Equality Properties

Step-by-step explanation:

Step 1: Define Equation

4x + 9 = 2x + 15

Step 2: Solve for x

Subtract 2x on both sides: 2x + 9 = 15
Subtract 9 on both sides: 2x = 6
Divide 2 on both sides: x = 3

Step 3: Check

Plug in x into the original equation to verify it's a solution.

Substitute in x: 4(3) + 9 = 2(3) + 15
Multiply: 12 + 9 = 6 + 15
Add: 21 = 21

Here we see that 21 does indeed equal 21.

∴ x = 3 is the solution to the equation.

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2 years ago

A number plus itself, plus twice itslef, plus 4 times itself, is equal to -104. what is the number?

Nutka1998 [239]

Let's represent this unknown number with the variable 'n'
n + n + 2n + 4n = -104

Explanations:
'n+n' - a number plus itself
'+2n' - plus twice itself
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Anyway:
n + n + 2n + 4n = -104
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3 years ago

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kvv77 [185]

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3 years ago

Read 2 more answers

An ion channel can be in either open (O) or closed (C) states. If it is open, then it has probability 0.1 of closing in 1 micros

iragen [17]

Answer:

a) P (COO) = 0,135

b) P ( SISI) = 0,00015

Step-by-step explanation:

a) the probability of an ion channel in open position is 50 % 0,5

the probability of an ion channel in close position is 50 % 0,5

probability for the following sequence of states COO

to be closed 0,5 (C)

from (C) to pass to open 0,3 (O)

and to stay O is 0,9

Then the probability of the sequence of states COO is

P (COO) = 0,5 * 0,3 * 0,9

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b) If people are either infected or susceptible, then

Probability of an individual infected is 0,5

Probability of an individual susceptible is 0,5

to pass from susceptible to infected is 0,05

to pass from infected to susceptible is 0,12

then

P ( SISI) = 0,5 * 0,05*0,12*0,05

P ( SISI) = 0,00015

probability for the following sequence of states COO

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3 years ago

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lozanna [386]

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Step-by-step explanation:

Draw a picture (see attachment)

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2 years ago