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Hoochie [10]
2 years ago
8

A bank randomly surveyed 50 of its customers by mail to find out how customers use its mobile banking service. The survey found

that only 11 of the 50 customers used the service.
If the branch has 1,700 customers, about
customers use the mobile banking service.
Mathematics
1 answer:
LekaFEV [45]2 years ago
4 0

22 percent of the costumers used the service

and 78 percent didnt

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PLEASE HELP ME!!!!!!!!!
vitfil [10]
<h2>1)</h2>

(x - 4) {}^{2}  - 28 = 8 \\ (x - 4) {}^{2}  = 8 + 28 \\ (x - 4) {}^{2}  = 36

This must be true for some value of x, since we have a quantity squared yielding a positive number, and since the equation is of second degree,there must exist 2 real roots.

\sqrt{(x - 4) {}^{2} }  =  ± \sqrt{36}  \\x - 4 = ±6 \\ x _{1}- 4 = 6 \:  \:  \:  \:  \:  \:  \: \:  \:  \:  x _{2}- 4 =  - 6 \\ x_{1} = 6 + 4 \:  \:  \:  \:  \:  \:  \:  \:  \:  \: x_{2} =  - 6 + 4 \\ x_{1} = 10 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:   \:  \:  \: \:  \: x_{2} =  - 2

<h2>2)</h2>

Well he started off correct to the point of completing the square.

(x - 3)  {}^{2}  = 16 \\ x - 3 = ±4 \\  \: x_{1}  - 3 = 4 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: x_{2}  - 3 =  - 4 \\ x_{1}  = 7 \:  \:  \:  \:  \:  \:  \:  \:  \:  \: x_{2}  =  - 1

8 0
1 year ago
Factor completely.<br> 28 - 7x^2
Studentka2010 [4]

Answer:

−7x^2+28

Step-by-step explanation:

28−7x^2

=28+−7x^2

=−7x^2+28

6 0
4 years ago
Sam has three identical tennis balls with a diameter of 2.7 inches. Determine the volume of all three tennis balls?
melamori03 [73]

Answer:

They are 30.93 in³ altogether.

Step-by-step explanation: V = 4/3 π r³

r = 2.7/2 = 1.35

π x 1.35 x 1.35 x 4/3 = 10.31 in³

10.31 x 3 = 30.93

3 0
3 years ago
What is the slope of this line
Oxana [17]

Answer:

y=-4

Step-by-step explanation:

8 0
3 years ago
What is the slope of the line?<br> y +3 = -4(x+7)
Svetach [21]

Answer:

  -4

Step-by-step explanation:

Compare this to the form ...

  y -y1 = m(x -x1)

which is the point-slope form of the equation for a line. Matching the parts of the equation, you see that ...

  • y1 = -3
  • m = -4
  • x1 = -7

m represents the slope of the line. The slope is -4.

8 0
3 years ago
Read 2 more answers
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