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KatRina [158]
4 years ago
12

ERROR ANALYSIS In Exercises 39 and 40, describe and

Mathematics
1 answer:
expeople1 [14]4 years ago
6 0

Answer:

39. r = 13.4

40. m = 12

Step-by-step explanation:

39. Given the equation, -0.8 + r = 12.6, to solve for r, the following are the correct steps to take to arrive at the solution:

-0.8 + r = 12.6 (given)

Add 0.8 to both sides of the equation (addition property of equality)

-0.8 + r + 0.8 = 12.6 + 0.8 (this is where the error occurred.)

r = 13.4

40. The correct steps to take in solving the equation, -\frac{m}{3} = -4 is as follows:

-\frac{m}{3} = -4 (given)

Multiply both sides by 3 (multiplication property of equality)

3*-\frac{m}{3} = 3*(-4)

-m = -12 (this is where the error occurred. This is what we should have at this line/step)

m = 12 (dividing both sides by -1)

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12 + 3x - 7 = 7x = 7 - 4x<br><br><br> a. always<br> b. sometimes<br> c. never
Rasek [7]
I think the answer is sometimes or never.

7 0
4 years ago
Wilma is thinking of a number that is divisible by both 17 and 8. What is the
svet-max [94.6K]

Answer: The smallest possible number is 136.

Step-by-step explanation:

1. You need to find the Least common multiple (LCM), which is the smallest of the common multiples of 17 and 8.

2. You can descompose 17 and 8 into primes factors. Then, you obtain:

17=17

8=(2)(2)(2)=2^{3}

3. Now, you must choose commons and no commons with the greatest exponent and multiply them. Therefore the result is:

(17)(2^{3})=136

LCM=136


5 0
3 years ago
Rectangle has a length of 6 units and width of y units write an expression for the are of the rectangle
Alexandra [31]

Answer:

Step-by-step explanation:

8 0
3 years ago
Geometry IXL help pls !
Trava [24]

Answer:

The answer to your question is 10 in

Step-by-step explanation:

Data

Circumference = 20π in

Radius = x

Formula

Circumference = πd

Process

1.- Equal the formula to the circumference

            πd = 20π

2.- Solve for d

               d = 20π / π

3.- Simplification

               d = 20

4.- Find the radius

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3 0
3 years ago
CAN SOMEONE PLZ HEP!?!?!?
kaheart [24]
The area of the collector panel is (its length) x (its width).

You know the long dimension ... it's 12 feet.
You need to find the short dimension.

The short dimension is the hypotenuse of the right triangle at the end of
the whole setup ,,, the triangle colored black.

In that right triangle, the leg standing up is 5-ft, and the acute angle 
that's down on the roof is 54° degrees.  Can you find the length of
the hypotenuse with this much information ?

How about . . . . .  <u>sin(54°) = 5 / hypotenuse</u><u>  ?</u>
(This is the big breakthrough.  From here, the answer
practically falls into your lap.)

Multiply each side by 'hypotenuse'  :      sin(54°) x (hypotenuse)  = 5

Divide each side by  sin(54°) :          Hypotenuse = 5 / sin(54°)

And there it is.       

Area of the collector = (12-ft) x [ 5-ft / sin(54°) ]

That's    (60 square feet) / sin(54°)  =  <em>74.164 square feet</em> (rounded)
6 0
4 years ago
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