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faust18 [17]
3 years ago
12

Find the missing number if the average is 7.

Mathematics
1 answer:
Art [367]3 years ago
8 0

Answer:

A) 8

Step-by-step explanation:

The average of two numbers is 7.

6 and x have an average of 7.

sum of terms / number of terms = average

(6 + x)/2 = 7

6+x = 14

x = 8

The number is 8.

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4 0
3 years ago
The percentage increase in the area of a rectangle if each of its sides is increased by 20% is.
SVETLANKA909090 [29]

The percentage increase in the area of a rectangle is 44% if each of its sides is increased by 20%.

<h3>What is a rectangle?</h3>

It is defined as two-dimensional geometry in which the angle between the adjacent sides is 90 degrees. It is a type of quadrilateral.

It is defined as the area occupied by the rectangle in two-dimensional planner geometry.

The area of a rectangle can be calculated using the following formula:

Rectangle area = length x width

New length = (120x/100)  m

New breadth = (120y/100)  m

New area = (6x/5 × 6y/5) m²

The difference between the original area = xy

new area 36xy/25

Percentage increase = (11xy/25 1/xy x 100)

= 44%

Thus, the percentage increase in the area of a rectangle is 44% if each of its sides is increased by 20%.

Learn more about the rectangle here:

brainly.com/question/15019502

#SPJ4

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