Answer:
63 cm²
Step-by-step explanation:
the area of ∆YXZ = 7 × 3² = 7×9 = 63 cm²
Answer:
x = 6 units
Step-by-step explanation:
By geometric mean property:

Answer: 40 times
Step-by-step explanation:
Given: Total planks = 20
By using integers, Steps forward is represented by +5, Steps backward s represented by -4.
After first set of two steps ( one forward another backward), 5-4 =1 step forward is captured.
For 20 planks , we require 20 such sets, i.e. he will do this 2x 20 times i.e. 40 times.
Hence, he will do this 40 times to reach the other side.
Answer:
= 13.25 dollars
Step-by-step explanation:
The total cost of the books is
0.75*9=6.75
So the amount of money returned is 20-6.75
= 13.25 dollar