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Karo-lina-s [1.5K]
3 years ago
5

Help me on this.what can be used in step 3?​

Mathematics
1 answer:
wolverine [178]3 years ago
5 0

Step-by-step explanation:

answer is been attached, hope u understand

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The average age of staff in the maths department is 40.
pashok25 [27]

Answer:

Cerian is 28 years old

Step-by-step explanation:

The given parameters are;

The average age of the staffs in the mathematics department = 40

The number of staffs in the department = 7

The average age of Jill, Nicky and Wendy = 41

The average age of Andy, Alan and Cathy = 43

From the given parameters, we have;

The average age of the staffs in the mathematics department = (The sum total of the ages of the members of the math department)/(The number of staffs in the department)

Therefore;

40 = (The sum total of the ages of the members of the math department)/ (7)

From which we have;

The sum total of the ages of the members of the math department = 40 × 7 = 280

Which gives;

Jill's age + Nicky's age + Wendy's age + Cathy's age + Cerian's age + Alan's age + Andy's age = 280 years

The average age of Jill, Nicky and Wendy = 41

Given that Jill, Nicky, and Wendy make up 3 of the 7 members of staffs, we have;

The average age of Jill, Nicky and Wendy = (The sum total of the ages of Jill, Nicky, and Wendy)/(The number of staff Jill, Nicky, and Wendt make)

Therefore;

The sum total of the ages of Jill, Nicky, and Wendy = 41 × 3 = 123

Which gives;

Jill's age + Nicky's age + Wendy's age = 123 years

Similarly, the sum total of the ages of Andy, Alan, and Cathy = 43 × 3 = 129

Which gives;

Andy's age + Alan's age + Cathy's age = 129 years

Therefore;

Cerian's age = (Jill's age + Nicky's age + Wendy's age + Cathy's age + Cerian's age + Alan's age + Andy's age) - (Jill's age + Nicky's age + Wendy's age) + (Andy's age + Alan's age + Cathy's age)

∴ Cerian's age = 280 years - 123 years - 129 years = 28 years

6 0
3 years ago
a rectangle is 5 inches long and 2x inches wide. The value of the perimeter is 22 inches what is the value of x?
Alekssandra [29.7K]

Answer: x =3

Step-by-step explanation:

2× 3 = 6

length= 5 inches

width= 2×3= 6 inches

2(l+w) = 2(5+6)

2(11)

2×11= 22

hope this helps:-)

4 0
3 years ago
A teacher wrote the numbers 10 ,-2, 4, 3, -1, -7 ,1 on a white board.the teacher asked which number should she write in order to
storchak [24]
Let x be that number:

x +10 -2 +4 + 3 - 1 - 7 +1 = 0

 x +8 = 0

and x = - 8

3 0
3 years ago
Graph the function y = (x – 3)2 + 2<br> -
STatiana [176]

Answer:

zoom in

Step-by-step explanation:

8 0
3 years ago
HELP ASAPPPP !!!! NEED ANSWERS NOW!!
Nikitich [7]

Answer: 1. 2nd endpoint  (24,-18)       2. 2nd endpoint: (-19,4)

Step-by-step explanation:

1.   \frac{-10+x}{2} = 7  x = 24

    \frac{6+y}{2} = -6    y= -18

2nd endpoint: (24,-18)

   

2.  \frac{-1+x}{2} = -10   x= -19  

   \frac{0+y}{2} =  2     y= 4

6 0
3 years ago
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