Algebra Test - 1

Explanation:

This is correct as this expression has only numerics or constants and no variables represented with alphabets.

Explanation:

The statement can be expressed as 

25 + r

Explanation:

since perimeter of any closed geometrical shape = sum of the lengths of all of its sides.

here length of each side = l unit

therefore, required perimeter = l + l + l = 3l unit

Explanation:

The sum of two whole numbers is same, no matter in which order they are added. This is called the commutative property. 

Ex : 2 + 3 = 3 + 2 => 5

Explanation:

a diameter of circle is any straight line segment that passes through the center of the cicle it can also be defined as the longest chord of the cicle.

since diameter of circle of radius r = 2 x radius of  the circle

D = 2r

Explanation:

As we know that perimeter of any closed geometrical figure = sum of the lengths of all its sides or boundaries.

here equilateral triangle has 3 sides of equal length = x unit

therefore, required perimeter of an equilateral triangle = x + x + x = 3x unit

Explanation:

perimeter of any geometrical shape is equal to the sum of length of its all sides

square has 4 sides of equal length

here side of a square = n cm

therefore required perimeter of square =

( n + n + n + n ) cm = 4n cm

Explanation:

no. of pencils distributed per student = 15

no. of students = y

therefore total no. of pencils distribeted = ( no. of pencils distributed per student) x ( no. of students) = 15y

Explanation:

Follow Unitary method.

Number of mangoes in 1 basket= x

Number of baskets=5

Total number of mangoes in 5 basket=(number of mangoes in 1 basket )x (number of basket)

=5x.

Explanation:

Two matchsticks to form the angle and one matchsticks to join the arms in the middle.