Question

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Answer 1

Answer:

Step-by-step explanation:

Q1.The result when x=5 and y=-1 is -13

Step-by-step explanation:

Given expression is 0.2xy(3x+2y)

To find the given product of the expression and verify the result when x=5 and y=-1 :

0.2xy(3x+2y)

=0.2xy(3x)+0.2xy(2y)

Therefore 0.2xy(3x+2y)

The product for the given expression is

Now verify the result when x=5 and y=-1 :

Put x=5 and y=-1 in the above expression we get

The result when x=5 and y=-1 is -13

Q2.Let the number of boys = x.

Then the number of girls will be 2/5 of the boys = 2/5 * x.

Given that Total number of students = 49.

x + 2/5 * x = 49

7/5 * x = 49

7x = 49 * 5

x = 245/7

x = 35.

Therefore the number of boys in the class = 35

Q3. 2x-3=15x/10-36/10

2x-3=15x-36/10

10(2x-3)=15x-36

20x-30= 15x-36

20x-15x= -36+30

5x=-6

x= -6/5

Q4.Cuboid have vertices =8,

Faces =6,

and edges =12

Hence, solved.

Q5.a square has 4 lines of symmetry 1st vertically from center 2nd horizontally from center 3rd and 4th diagonally

Q6. Let the radius of two circle be 2x and 3x respectively.

Now,

Circumference of a circle = 2πr

Circumference of first circle

= 2 × π × 2x

= 4 x π

Circumference of second circle

= 2 × π × 3x

= 6 x π

Ratio of Circumference of two circles ;

Hence, ratio of their Circumferences is 2 : 3

Q7. area of triangle=1/2*BH

= 1/2 *15*15=225/2=112.5cm2

Q8. By ASA congruence criterion this triangle is congruent.

Q9. Median= 1000

Mode= 750