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g100num [7]
3 years ago
6

Maria practised football for 1

Mathematics
1 answer:
krok68 [10]3 years ago
7 0

Answer:

348 hrs

Step-by-step explanation:

Hours of football practiced altogether = sum of hours practiced on friday and Saturday

Therefore

125 + 223

= 348 hrs

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An instructor wants to write a test with 25 questions where each question is worth 3, 4, or 5 points based on difficulty. He wan
irakobra [83]

ANSWER

Find out the how many 3, 4, and 5 point questions could there be.

To proof

Let us assume that the 3 points based question be = x

Let us assume that the 4 points based question be = y

Let us assume that the 5 points based question be = z

As given

An instructor wants to write a test with 25 questions

than the equation become in the form

x + y + z = 25

he quiz to be worth a total of 100 points.

than the equation is becomes

3x + 4y + 5z =100

As given

He wants the number of 3-point questions to be 4 less than the number of 4-point questions

x = y -4

Than the three equation are

x + y + z = 25 ,3x + 4y + 5z =100 and x = y -4

put  x = y -4 in the x + y + z = 25 ,3x + 4y + 5z =100

than

2y + z = 29, 7y +5z= 112

multiply 2y + z = 29 by 5 and subtracted 7y +5z= 112

10 y -7y + 5y -5y = 145 -112

3y = 33

y = \frac{33}{3}

y =11

put in the  x = y -4

x = 11-4

x= 7

put the value of x ,y in the x + y + z = 25

7 + 11 +z =25

18 +z = 25

z = 25 -18

z=7

therefore

numbers of the 3 point question be = 7

numbers of the 4 point question be = 11

numbers of the 5 point question be = 7

Hence proved



3 0
3 years ago
A car costs 20% less this year than last year. Last year, the car cost 5% less than the year before. The price of the car this y
Tems11 [23]

Answer:

The answer is 11,374

Step-by-step explanation:

First we find 5% of 9,400 is.

9,400 * 5% = 470

Next we add 9,400 with 470 then multiply by 20%

9,400 + 470 = 9,870

9,870 * 20% = 1974

Next we add.

9,870 + 1,974 = 11,374

So, the answer is 11,374

Hope this helps! :)

3 0
3 years ago
Find the mean of the following number set: 89, 76, 85, 76, 77, 84
klio [65]

Answer:

81.167~

Step-by-step explanation:

You can find the mean (or average) of a set of numbers by adding them together and dividing the sum by the amount of values there are.

In this case, there are 6 values.

The total sum of the six values is 487.

To receive the mean, divide 487 by 6.

6 0
3 years ago
Read 2 more answers
A fish is 80 below sea level. If it ascends 25 feet, what is its new position
Elena-2011 [213]

Answer:

THEN ITS POSITION FROM SEA LEVEL=80-25

=55

4 0
3 years ago
A 450 square foot apartment in New York City cost 540,000. What is the price per square foot explain or show your reasoning
Anton [14]

The cost of per square foot is 1200.

Step-by-step explanation:

Given,

Total area = 450 Square foot

Total cost = 540000

Cost of per square foot = \frac{Total\ cost}{Total\ Area}

Cost\ per\ square\ foot=\frac{540000}{450}\\Cost\ per\ square\ foot= 1200

The cost of per square foot is 1200.

Keywords: Area, Division

Learn more about division at:

  • brainly.com/question/11280112
  • brainly.com/question/11286417

#LearnwithBrainly

8 0
3 years ago
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