MATHEMATICS MIDDLE SCHOOL

The cost of 5 similar digital cameras and 3 similar video cameras is 3213. Each video camera costs 4 times as much as each digital camera. John buys a digital camera and a video camera. How much does he pay?

Answers

Answer 1
Answer: x\ -\ cost\ of\ digital\ camera\ny\ -\ cost\ of\ video\ camera\n5x+3y=3213\ny=4x\n5x+3\cdot4x=3213\n17x=3213/:17\nx=189\ny=4\cdot189\ny=756\n\n189+756=945
Answer: John pays 945 for a digital camera with a video camera.

I hope I helped :D
Answer 2
Answer:

Answer:

945

Step-by-step explanation:

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What the the equation -984-n=-285 what does n equal

Answers

When you do this, you want to isolate one variable on one side of the equation. Add 984 to both sides, first. You get -n = 699. 
You aren't done yet because the problem isn't complete until the variable is positive. To do that, multiply both sides by -1.
The answer is n = -699.
Hope that helped you!
-984-n=-285
+n
-984=-285+n
+285
-699=n

n is equal to -699

Is 0.08 equivalent to 80/100

Answers

no it is 8/100 
LOLOLOLOL
No bc it is in the hundreths place

Find the x-intercepts of the parabola withvertex (-2,-8) and y-intercept (0,4).
Write your answer in this form: (X1,41), (x2,42).
If necessary, round to the nearest hundredth.
Enter the correct answer.

Answers

Answer:

The x-intercepts are (2+√(8/3),0) and (2-√(8/3),0)

Step-by-step explanation:

y = A(x+2)2 - 8

Since (0,4) is on the graph, 4 = 4A-8

4A = 12

A = 3

So, y = 3(x+2)2-8

To locate the x-intercepts, set y = 0 and solve for x:

0 = 3(x+2)2-8

3(x+2)2 = 8

x+2 = ±√(8/3)

x = -2 ± √(8/3)

The Colorado River is 1,450 miles long. This is 752 miles shorter than the Mississippi River. Write an equation that describes this relationship.

Answers

1450-752=698 miles long Mississippi River.

What is one half added to three tenths

Answers

one \ half \to (1)/(2) \n\n three \ tenths \to (3)/(10) \n\n (1)/(2)^((5)+(3)/(10)= \n\n=(5+3)/(10)= \n\n =(8)/(10)\to\boxed{\boxed{(4)/(5)}}
\boxed{ (1)/(2)+ (3)/(10) = (1*5)/(2*5) + (3)/(10) = (5)/(10)+ (3)/(10) = (8)/(10)=0,8 }

All cylinders are prisms. True or false?

Answers

It is false! Not every cylinder is a prisem. 
the answer is false all cylinders are not prisms
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