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solmaris [256]
3 years ago
10

Solve for 5x - 7 + 2x = 21 Help this will be very much appreciated .

Mathematics
2 answers:
dexar [7]3 years ago
6 0

Answer:

x = 4

Step-by-step explanation:

Pull out like factors:  7x - 28  =   7 • (x - 4)

Solve:  x-4 = 0

Add  4  to both sides of the equation: x = 4

Please mark as brainliest.

Thanks!

Alex_Xolod [135]3 years ago
4 0
I think it’s 4 but I’m not sure
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If 2a+ 2/a =4, what is the value of 2a^2− 2/a^2 ?
aliina [53]

Answer:

0

Step-by-step explanation:

2a+ 2/a =4

Multiply each side by a to clear the fraction

a( 2a+ 2/a) =4*a

Distribute

2a^2 +2 = 4a

Subtract 4a from each side

2a^2 -4a +2 = 4a-4a

2a^2 -4a +2 =0

Divide by 2

2/2 a^2 -4a/2 +2/2 =0/2

a^2 -2a +1=0

Factor

(a-1) (a-1) =0

Using the zero product property

a=1

2a^2 -2/a^2

2(1)^2 -2/1^2

2-2

0

5 0
3 years ago
Which of the following graphs model exponential functions? Select all that apply.
shusha [124]

The given graphs model exponential functions are  a, b and c.

Option a, b and c are the correct answers.

To choose the graph.

<h3>What is exponential function?</h3>

A relation of the form y = ax, with the independent variable x ranging over the entire real number line as the exponent of a positive number a.

Given that:

The three graphs in the second picture are the graphs of exponential functions. You can detect it from the L shaped graphs.

The very first graph represents a linear function. A straight line always represents a linear function. In a Linear function, the change in the values of y is constant throughout in relative to change in x values.

Therefore,  the given graphs a, b and c are the correct answers.

Learn more about exponential function here:

brainly.com/question/28189362

#SPJ1

8 0
11 months ago
I FORGOT THE LAST ONE
zalisa [80]
I think it’s 3.2 but I don’t know
5 0
3 years ago
Read 2 more answers
I’ll mark you brainlist I’ll mark you brainlist
tatyana61 [14]

Answer:

neither

Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
The total cost for one year at the state university is $22,500. a student has the following help in covering the costs of school
Klio2033 [76]

Answer:

$630 Per Month

Step-by-step explanation:

$22,500-$10,000=$12,500-$4,400=$8,100-$1,800=$6,300/10Months

=$630

6 0
1 year ago
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