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3 years ago

Plzzzzzzzzz guysssss im failinggggg

Mathematics

1 answer:

goblinko [34]3 years ago

6 0

Step-by-step explanation:

a) Given, 

Total marks in English = 90

Marks scored by James = 60

Therefore, 

Percentage of marks scored

$= \frac{60}{90} \times 100$

= 66.67% (approx. )

Then,

Total marks in Science = 150

Marks scored by James = 78

Therefore, 

Percentage of marks scored

$= \frac{78}{150} \times 100$

= 52%

At last,

Total marks in Maths = 120

Marks scored by James = 75

Therefore, 

Percentage of marks scored

$= \frac{75}{120} \times 100$

= 62.50%

b) In English test  James scored highest percentage.

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A manufacturing company builds construction machinery. It sells 10 machines for $18,100 and 20 machines for $26,600. Which equat

Anon25 [30]

<h3>Answer:</h3>

D. R(x) = 850x +9600

<h3>Step-by-step explanation:</h3>

Selling 10 more machines increased revenue from $18100 to $26600, an increase of ...

... $26,600 -18,100 = $8,500

That is, the revenue increased by $8500/10 = $850 per machine.

Only one answer choice has this number in it:

... D. R(x) = 850x+9600

_____

Check

R(10) = 850·10 +9600 = 8500 +9600 = 18,100 . . . . OK

R(20) = 850·20 +9600 = 17000 +9600 = 26,600 . . . . OK

_____

Comment on answer selection

On multiple-choice questions, it is rarely necessary to work out the solution to the problem completely. Usually, it is sufficient to find the one number that discriminates between correct and incorrect answers.

In real life, answers are rarely multiple-choice. You are required to work the problem completely and to figure out how to tell if your answer is correct.

Here, we have worked the problem far enough to find the slope, the amount by which revenue increases when sales increases by 1 unit. The intercept can be found different ways. One of them is to see what number makes the revenue match for one of the "x" values:

... R(10) = 850·10 +b = 18100

... b = 18100 -8500 = 9600

so ...

... R(x) = 850x +9600

We can check this answer by computing R(20), as we have above.

8 0

3 years ago

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Ava pours 3 gallons of paint equally into 8 cans How many gallons of paint will

SashulF [63]

Answer: 3/5 or 0.6 gallons

Step-by-step explanation: