Which algebraic rule describes the 180° counter-clockwise rotation about the origin?
2 answers:
Answer:
Step-by-step explanation:
We are asked to write the algebraic rule that describes the 180° counter-clockwise rotation about the origin.
When we rotate a point 180 degrees about origin the coordinates of point changes their sign.
The point after a rotation of 180 degrees about origin changes to
.
The rule for this rotation is:
Therefore, our required expression would be .
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Answer:
Step-by-step explanation:
It is given that,
Length of each brick = 10 inches
Mortar between between each brick = 1 inch
For 2 bricks, we need mortar once.
For 3 bricks, we need mortar 2 times.
For 4 bricks, we need mortar 3 times.
Similarly,
For n bricks, we need mortar (n-1) times.
Total length of n bricks = 10n inches
Total length of (n-1) times mortar = 1(n-1) = n-1 inches
Total length of wall = 10n + (n-1) inches.
1 feet = 12 inches
10 feet = 120 inches
The equation to model the number of bricks,n, nikki needs in each layer to build a wall 10 feet long.
Therefore, the required equation is .