14 science fiction, 2 romance, 4 biography, 10 adventure...total of 30 books
P(biography) = biographies / total books = 4/30 which reduces to 2/15 <=
Answer:
15.5 feet
Step-by-step explanation:
Given:
Patty is building a rope ladder tree house she needs two 4 foot pieces of rope for the sides of the ladder.
She needs 6 pieces of rope each 15 inches long for the steps.
Question asked:
How many feet of rope does patty need to make the ladder ?
Solution:
She needs for the sides of the ladder = Two 4 foot pieces of rope
= 2
4 feet = 8 feet
She needs for the steps of the ladder = 6 pieces of 15 inches long rope
= 6
15 inches = 90 inches
Convert 90 inches into feet:-
12 inches = 1 feet
1 inches = 
90 inches = 
Patty needs total rope = 8 feet + 7.5 feet
= 15.5 feet
Thus, Patty needs 15.5 feet of rope to make the ladder.
The answer is alternate interior angles theorem and substitution property of equality.
Answer:
90 kg of stone
Step-by-step explanation:
Adam has 8 x 25 = 200
19 x 22.5 = 427.5
20 x 50 = 1000
He has enough cement and sand
He needs 1090 - 1000 = 90 kg of stone
He needs 2 bags of stone