This is the number of combinations of 2 from 23
23C2 = 23! / 2! 21!
A quick way to do this is 23*22 / 2 = 253
Step-by-step explanation:
the answer is lbs i think
Answer:
37
Step-by-step explanation:
35^2+12^2=1369
√1369=37
Answer:
A = 450 cm²
Step-by-step explanation:
Since the right triangle is isosceles then the 2 logs are congruent , both 30 cm and at right angles to each other.
The area (A ) of the triangle is calculated as
A =
bh ( b is the base and h the perpendicular height )
Here b = h = 30 , then
A =
× 30 × 30 =
× 900 = 450 cm²
Answer:
down in rate = 680-540 = 140
% change = 140*100/680 = 20.58%