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3 years ago

What statement makes the open sentence 3x + 20 = 5x + 6 true? x = 2 x = 4 x = 7 x = 13

Mathematics

1 answer:

sergiy2304 [10]3 years ago

7 0

Answer:

x = 7

Step-by-step explanation:

3x + 20 = 5x + 6

3x - 5x = 6 - 20

-2x = -14

x = 14/2

x = 7

the value of x = 7

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F [ x ] = [ x - 3] [ x + 8 ]

bogdanovich [222]

Answer:

f [ x ] = [ x - 3] [ x + 8 ] = x^2 + 5x - 24

Step-by-step explanation:

f (x)=[ x - 3] [ x + 8 ]

x [ x + 8 ] -3[ x + 8 ]

x^2 + 8x - 3x - 24

x^2 + 5x - 24

8 0

2 years ago

Mason opens a savings account by making a $165.85 deposit. Every week, he deposits another $20.50 in the account.

tiny-mole [99]

Answer:

i think that it would be

$370.85

Step-by-step explanation:

The following expression shows the amount of money in the account after x weeks.

If $20.50 was added to the account for 10 weeks we can substitue 10 as the x:

$370.85 will be in the account after 10 weeks

8 0

2 years ago

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Expand and simplify 5(y-2) 2(y-3)

Oksana_A [137]

5y-10 and 2y-6 unless the two are together in which case are they being added or multiplied (the equations).

4 0

3 years ago

option 1 drop down are: even-odd identity, quotient identity, Pythagorean identity, double-number identity.option 2 drop down ar

motikmotik

Answer:

The equation is given below as

$\frac{\cos2x}{\cos x}=\cos x-\sin x\tan x$

Step 1:

We will work on the left-hand side, we will have

$\begin{gathered} \cos x-\sin x\tan x \\ \text{recall that,} \\ Quoitent\text{ identity is} \\ \tan x=\frac{\sin x}{\cos x} \end{gathered}$

By substituting the identity above, we will have

$\begin{gathered} \cos x-\sin x\tan x=\cos x-\frac{\sin x.\sin x}{\cos x}=\cos x-\frac{\sin^2x}{\cos x} \\ \end{gathered}$

Here, we will make use of the quotient identity

Step 2:

By writings an expression, we will have

$\begin{gathered} \cos x-\sin x\tan x=\cos x-\frac{\sin x.\sin x}{\cos x} \\ \cos x-\sin x\tan x=\frac{\cos^2x-\sin^2x}{\cos x} \end{gathered}$

Here, we will use the definition of subtraction

$\cos x-\frac{\sin^2x}{\cos x}$

Step 3:

We will apply the double number identity given below

$\begin{gathered} \cos 2\theta=\cos (\theta+\theta)=\cos ^2\theta-\sin ^2\theta \\ \cos 2x=cos(x+x)=\cos ^2x-\sin ^2x \end{gathered}$

By applying this, we will have

$\frac{\cos^2x-\sin^2x}{\cos x}=\frac{\cos2x}{\cos x}$

Here, we will use the double number identity

$\frac{\cos^2x-\sin^2x}{\cos x}$

5 0

1 year ago

if Leah makes $9.50 per hour and she works 36 hours this week, how much will her paycheck be before taxes?

Dafna11 [192]

Answer:

Leah makes $342 before tax.

Step-by-step explanation:

9.50 x 36 = 342

Leah makes $342 before tax.

I hope this helped and if it did I would appreciate it if you marked me Brainliest. Thank you and have a nice day!

3 0

2 years ago

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