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Inga [223]
3 years ago
13

Which of the following is a solution of x2 - 7x = -5? A. 7 plus or minus the square root of 69 divided by two. B. 7 plus or minu

s the square root of 29 divided by two. C. negative 7 plus or minus the square root of 29 divided by two. D. negative 7 plus or minus the square root of 69 divided by two.
Mathematics
2 answers:
Triss [41]3 years ago
8 0

Answer:

B. 7 plus or minus the square root of 29 divided by 2

Step-by-step explanation:

I just took the test

kotykmax [81]3 years ago
7 0
X² - 7 x = - 5
x² - 7 x + 5 = 0
The standard form is : ax² + b x + c = 0
a = 1;  b = -7;  c = 5
x 1/2 = (-b+/- √(b²-4 ac) / 2a
x 1/2 = (7+/-√49 - 20) / 2 = ( 7 +/-√29 ) / 2
Answer: B ) 7 plus or minus the square root of 29 divided by two.
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lozanna [386]

The question is worded a bit strangely (in my opinion anyway), but I think your teacher wants you to describe how exponents work.

Let's say we had the expression 5^3

The base is 5 as its the bottom most value (think of something like the base of a tree or building). The exponent is 3.

The exponent of 3 tells the reader to multiply the base 5 by itself 3 times like so

5^3 = 5*5*5 = 125

With larger exponents, it becomes more tedious to write out all the repeated multiplications, which is why many calculators have an exponent button to save time.

5 0
3 years ago
Mario went to a store and bought 3 slices of pizza. The guy at the register said " that would be $3.75". Mario then said "wait,
Zarrin [17]

Answer:

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Step-by-step explanation:

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3 years ago
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Step-by-step explanation:

7 0
3 years ago
N+ 12 = -24<br><br> Help please
omeli [17]

Answer:

n = -36

Step-by-step explanation:

The answer is -36 because:

1) We first have to subtract -24 and 12 to find n

-24 - 12 = -36

This is because whenever there are two negative signs, multiply it.

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We have to do, 24 + 12 which is 36. Finally, we just put the greater number's sign to the answer. 24 is greater than 12, therefore, we put a negative sign before 36.

Hope this helps!

7 0
3 years ago
A local car wash is open 8 hours each day. It uses 1/3 of a container of wax for each car. The car wash waxes an average of 8 1/
sweet-ann [11.9K]

Answer:

22.67 containers.

Step-by-step explanation:

The number of cars washed is the average by the total hours worked:

C_{total}=\bar xt,\bar x=8.5,t=8\\\\C_{total}=8.5\times 8=68

Given that each car uses 1/3 tin of wax, the total containers is calculated as:

Containers=\bar x_c n,n=68,\bar x_c=\frac{1}{3}\\\\=\frac{1}{3}\times 68\\\\=22.67

Hence, the car wash uses 22.67 containers of wax per day.

8 0
3 years ago
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