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3 years ago

2x + 1 = 7 solve the equation pls help me im stuck on this question

Mathematics

2 answers:

aev [14]3 years ago

6 0

Answer:

$2x + 1 = 7 \\ 2x = 7 - 1 \\ 2x = 6 \\ x = \frac{6}{2} \\ x = 3$

Lynna [10]3 years ago

3 0

Answer:

x = 3

Step-by-step explanation:

Brainliest Please!

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Plz help me 25y−4+7−910y =

Elena-2011 [213]

Answer:

-885y+3

Step-by-step explanation:

3 0

3 years ago

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If Bart has 20$ and Andy took $19.65 how much does Bart have

Helen [10]

Answer:

well bart has 20.00

andy took 19.65

Step-by-step explanation:

subtract $20.00\\-19.65\\\\_______\\0.35$

your answer should be 0.35

8 0

3 years ago

-4x + y = -9 - 5x + 2y = 3 : Solve the Linear equation

Yuri [45]

-4x+y= -9 can be turned into
y= -9 + 4x

5x+2y=3 (plug y in)
5x+2(-9+4x)=3
5x-18+8x=3
5x+8x=3+18
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divide 13 on both sides
x=1.6

6 0

2 years ago

Select all of the numbers that are prime 17 18 19 20 21 22 23

Sveta_85 [38]

17, 19, 23.

Remember, prime numbers are numbers that can only be divided by 1 and itself.

8 0

3 years ago

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Find the exact value of cos 120° in simplest form with a rational denominator.

IRINA_888 [86]

Given:

cos 120°

To find:

The exact value of cos 120° in simplest form with a rational denominator.

Solution:

We have,

$\cos 120^\circ$

It can be written as

$\cos 120^\circ=\cos (90^\circ+30^\circ)$

$\cos 120^\circ=-\sin 30^\circ$ $[\because \cos (90^\circ-\theta)=-\sin \theta]$

$\cos 120^\circ=-\left(\dfrac{1}{2}\right)$ $[\because \sin 30^\circ=\dfrac{1}{2}]$

$\cos 120^\circ=-\dfrac{1}{2}$

Therefore, the exact value of cos 120° is $-\dfrac{1}{2}$ .

7 0

2 years ago