Hello from MrBillDoesMath!
Answer:
3 1/2 (i.e 3.5)
Discussion:
From the attached file, the area of the shaded triangle =
Area = <u>square</u> surrounding triangle -
area triangle 1 - area triangle 2 - area triangle 3
= 4 * 4 -
(1/2) (1 * 1) - (1/2) (3 * 4) - (1/2) (3 * 4)
= 16 - 1/2 - 1/2 (12) - 1/2(12) =
= 16 - 1/2 - 12 =
= 4 - 1/2
= 3 1/2
Where we have used that the area of a triangle =
(1/2) base * height.
Thank you,
MrB
As given,
The diameter of one glass bead = 0.4 cm
As the beads are stringed/attached end to end that means a straight line of beads (diameter) can be imagined and adding up all the diameters or multiplying the diameter with total number of beads, we can get the total length of the necklace.
Hence, the length can be found as =
cm
or converting this in meters we get meter
Hence, the necklace will me 40 meters long.
The question says that the end of the cave is 380 meters below.
Lets say the sea level or the surface is at 0 meters or we can say that it is the reference level for us.
Now if we go up the height will be measured with positive integer but if we go down the depth will be represented by a negative integer.
Negative integer also represents the depth or the distance below the surface level.
Here we need to generate an integer that can represent the depth of 380 meters.
So if we are going down we will use negative integer to represent.
Therefore, the integer to represent the depth is meters.