Answer:
Option A = 8t
Step-by-step explanation:
6t + 3t - 8t = t
6t + 3t = 9t
9t - 8t = t
Answer:7980 ways
Step-by-step explanation:
When select predident:21 ways
When select secretary: 20 ways
When select treasurer: 19 ways
It is permutation
N permutation r=NPR
20permutation3=21×20×19= 7980 ways
Answer:
90 is the answer
Step-by-step explanation:
360° / 4= 90°
Let point A (x₁, y₁) and point B (x₂, y₂)
Mid-point formula is given by:
![[ \frac{x_1+x_2}{2}, \frac{y_1+y_2}{2}]](https://tex.z-dn.net/?f=%5B%20%5Cfrac%7Bx_1%2Bx_2%7D%7B2%7D%2C%20%5Cfrac%7By_1%2By_2%7D%7B2%7D%5D%20)
The distance formula is given by:

The two formula are alike because they both need the information of two coordinate points
They are different because the mid point formula is adding up then divide by two, whereas the distance formula is subtracting then square the answer.
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Real life problem involving distance formula:
Plane A is spotted on a radar with cartesian coordinate (450, 640).
Plane B is spotted on the same radar with cartesian coordinate (350, 540)
Work out the distance between plane A and plane B.
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Real life problem involving mid point formula
Ms. Holland arranges a treasure hunt for a group of scouts. She marks two points, C and D, with cartesian coordinate (-5, 6) and (7, 10) respectively. The clue is that the treasure is buried in the middle point between C and D. Work out the coordinate where the treasure is buried.