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iren2701 [21]
3 years ago
15

In order to buy a $38 pair of shoes, you have to borrow $16 from your friend. How much money did you start with

Mathematics
2 answers:
Aleksandr-060686 [28]3 years ago
7 0

Answer:

22 dollars

Step-by-step explanation:

38 - 16 = 22

if they cost 38 subtract the amount you borrowed(16) and you get what you started with(22)

mina [271]3 years ago
3 0

Answer:

B 22

Step-by-step explanation:

You'll put x since you don't know how much the person started with then you do plus 16.

x+16=38

Subtract 16 both sides.

x=22

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3 years ago
Find a formula for the described function. An open rectangular box with volume 3 m3 has a square base. Express the surface area
Alex73 [517]

Answer:

SA(x) = x^2 + \frac{12}{x}

Step-by-step explanation:

Given

V = 3m^3 --- volume

x \to base\ length

y \to height

Required

The surface area as a function of base length

The volume (V) is calculated as:

V = Base\ Area * Height

V = x*x*y

V = x^2*y

Make y the subject

y = \frac{V}{x^2}

Substitute 3 for V

y = \frac{3}{x^2}

The surface area of the open box is:

SA = x^2 + 2xy+2xy

SA = x^2 + 4xy

Substitute: y = \frac{3}{x^2}

SA = x^2 + 4x*\frac{3}{x^2}

SA = x^2 + 4*\frac{3}{x}

SA = x^2 + \frac{12}{x}

Hence, the function is:

SA(x) = x^2 + \frac{12}{x}

4 0
3 years ago
I dont understand this problem
Fiesta28 [93]

Answer:

D and F

Step-by-step explanation:

x^{2}+4x+4=12 can be rewritten as x^{2} +4x-8=0.

From there you can use the quadratic formula x=\frac{-b±\sqrt{b^{2}+4ac } }{2a} (ignore the A, I can‘t seem to remove it), where a=1, b=4, and c=-8.

x=\frac{-4±\sqrt{4^{2}-4(1)(-8)} }{2(1)}

Then you get x=\frac{-4±\sqrt{16+32}}{2}

Then you get x=\frac{-4±\sqrt{48} }{2}

So x=-2±\frac{4\sqrt{3} }{2}

Which means x=-2+2\sqrt{3} or -2-2\sqrt{3} which are choices D and F.

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4 years ago
A mountain has a peak of 7070 meters above sea level. A valley has a depth of 7460
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7,265 is the average of those two numbers, though i am not sure what the sign that is mentioned is
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