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DanielleElmas [232]
3 years ago
13

3

Mathematics
1 answer:
Brut [27]3 years ago
8 0

Answer:

hygu

Step-by-step explanation:

yg9k

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Five students wrote a mathematics test. The average mark was 68. If the marks for four of the students were 75, 62, 84 and 53, t
konstantin123 [22]

Answer:

66

Step-by-step explanation:

Use the formula for the mean of a set of numbers:

                  sum of the numbers

average = --------------------------------

                     count of numbers

Here we know that the average mark was 68, so we can write:

               

                           75 + 62 + 84 + 53 + x

average = 68 = ----------------------------------

                                           5

or                            274 + x

                  68 = -------------------

                                    5

Solving for x, we multiply both sides by 5:     340 = 274 + x.

Subtracting 274 from both sides effectively isolates x:

 340 = 274 + x

- 274    -274

------------------------

  66      =    x

The fifth student's mark was 66.

4 0
3 years ago
Help plz I don’t understand #geometry
Bingel [31]
1. x=5
Explanation:
2(2x-3)=x+9
4x-6=x+9
-x -x
3x=15
x=5

2. x=-9
Explanation:
2(x+19)=x+29
2x+38=x+29
-2x -2x
9=-x
-9=x
7 0
3 years ago
What is 33 1/3 % in percent
NemiM [27]
The answer is 4.29 is the percent
6 0
3 years ago
F(x) = 2(x + 4)^2 (x - 2)​
Kryger [21]

Answer:

3

Step-by-step explanation:

hope it helpz >-<

7 0
2 years ago
Read 2 more answers
If the Diameter is ten then what is the area of it
Pepsi [2]

Answer:

78.54

Step-by-step explanation:

Hope this helps!

7 0
2 years ago
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