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Answers
Answer:
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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