Answer:
20. 13 cm
21. 12 cm
Step-by-step explanation:
20. isosceles means two sides are the same length, so you take the ten off the perimeter to get 26 remaining cm (36 -10) and you then divide that by two to get both sides of 13 cm (26 / 2)
21. because you know that if you split the triangle down the middle you get a right triangle and you can use a^2+b^2=c^2 to find the height, so we take the one side of 13 cm and half of the third side, which is 5, and you can find your answer (a^2 + 5^2 = 13^2 ---> a^2 + 25 = 169 ---> a^2 = 144 ---> a = 12)
For 2 6/8 it is 22/8 and for 3 4/8 it is 28/8 and if you subtract them it would be 6/8
hope this helps!
Answer: 60 pages left.
Step-by-step explanation:
Let the number of pages in the book be x.
As per given, we have
of total book = 
Pages left = 240-180
= 60
Hence, 60 pages left.
Answer: y=1/2x-1
Step-by-step explanation:
