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2 years ago

5. ERROR ANALYSIS Describe and correct the error in finding the sum of the number

Mathematics

1 answer:

Semmy [17]2 years ago

8 0

Answer:

(25 × 10") + 153 × 10" = (25 +153) × 10" = 178 × 10" = 1780"

Step-by-step explanation:

a) Numbers are miscopied: the numbers in parentheses should be (25 +153). Of course, the sum of these should be 178, not 78.

b) The common factor 10" is somehow expanded to 110' x 10°. It should be 10".

The sum should be ...

(25 × 10") + 153 × 10" = (25 +153) × 10"

= 178 × 10" = 1780" . . . . . correct sum

_____

Maybe the middle step is an attempt to convert to feet.

1780" × (1')/(12") = (148 1/3)' = 148' 4"

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4 coffees and 12 lattes. Costs $61

Gala2k [10]

Answer:

Cost of a coffee is <u>$2.5</u> and cost of a latte is <u>$4.25.</u>

Step-by-step explanation:

Let cost of 1 coffee be 'c' and cost of 1 latte be 'l' dollars.

Given:

4 coffees and 12 lattes cost $61.

12 coffees and 7 lattes cost $59.75.

∵ 1 coffee cost = $c$

∴ 4 coffees cost = $4c$ and 12 coffee cost = $12c$

∵ 1 latte cost = $l$

∴ 12 lattes cost = $12l$ and 7 lattes cost = $7l$

Now, as per question:

$4c+12l=61-----1\\12c+7l=59.75----2$

Now, multiplying equation (1) by -3 and adding the result to equation (2). This gives,

$-3(4c+12l)=-3(61)\\\\-12c-36l=-183\\12c+7l=59.75\\+\\----------\\0-29l=-123.25\\\\l=\frac{-123.25}{-29}=\$4.25$

Now, plug in the value of 'l' in equation 1 to solve for 'c'. This gives,

$4c+12(4.25)=61\\\\4c+51=61\\\\4c=61-51\\\\4c=10\\\\c=\frac{10}{4}=\$2.5$

Therefore, cost of a coffee is $2.5 and cost of a latte is $4.25.

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2 years ago

a pumpkin pie is made in a pie pan measuring 9 inches in diameter. it is cut into 8 equal slices. what is the length of the crus

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The length of the pie is 72

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2 years ago

Help please?!?!?!?!?!?!?

nadezda [96]

Answer:

Choice D is correct answer.

Step-by-step explanation:

We have given two function.

f(x) =2ˣ+5x and g(x) = 3x-5

We have to find the addition of given two function.

(f+g)(x) = ?

The formula to find the addition, we have

(f+g)(x) = f(x) + g(x)

Putting given values in above formula, we have

(f+g)(x) = (2ˣ+5x)+(3x-5)

(f+g)(x) = 2ˣ+5x+3x-5

Adding like terms, we have

(f+g)(x) = 2ˣ+8x-5 which is the answer.

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2 years ago