Question

1. If 3x + 4y =0 and x= 2y -5 , find the value of (X,y). 2. The sine of an angle is the ratio of the opposite to the? 3. Calculate the volume of a cylindrical steel bar which is 8cm long and 1.75cm in radius. (Take ) pi 22/7 Please help.

Answer 1

Answer:

1.

3x + 4y = 0

x - 2y = 5

Solving them simultaneously we get

x = 2 and y = -1.5

Value of (x , y ) is ( 2 , -1.5)

2. Sine of an angle is the ratio of the opposite to the Hypotenuse

3.

Volume of a cylinder = πr²h

r = radius h = height

V = 22/7 × 1.75² × 8

V = 22/7× 24.5

V = 77cm³

Volume of the cylinder is 77cm³

Hope this helps.