Answer:
Step-by-step explanation:
to find the surface area we need to find the followng areas:
- area of a triangle and multiply it by 4 (because there are 4 triangles)
And once we have those areas, we add them to find the surface area.
Area of the square:
the formula to find the area of a square is:
where 
is the length of the side: 
thus the area of the square is:
Area of the triangles:
the are of 1 triangle is given by
where 
is the base of the triangle: 
(the base of the triangle is the side of the square)
and 
is the height of the triangle: 
thus, the area of 1 triangle is:
the area of the 4 triangles is (we multiply by 4):
finally we add the area of the square and the area of the 4 triangles to find the total surface area:
Because it says "not black" we would do white marbles
There are 15 white marbles and a total of 20
So the fraction of white marbles to total would be 15/20
Because the answer is wanted as a decimal divide 15 by 20
15/20=.75
There is a .75 chance that she will not draw a black marble
Answer:
59/10
Step-by-step explanation:
59/10 simplifies to 5 9/10 which is 5.9. 5.9 is greater than 5.7!
Answer:
Step-by-step explanation:
if you multiply 2 to both sides, 2(3x+2y)=2*3, having 6x+4y=6
thus, the two equations are same (consistent), having infinite number of solutions (dependent).
6, 10, 15
15,21,35
35, 55, 77
77, 91, 143
143, 187, 221
I can go on forever
There are different possibilities
