Answer:
A. Elements and Compounds
I think
Step-by-step explanation:
The fraction of the total books about mammals is 7/18
Let the total number of books in the school be 1 whole , ie 12/12( since we are dealing with fractions)
Number of science books =7/12
Number of mammals books =2/3 of science books
=2/3 x 7/12=14/36 = 7/18
Since the total books are 12/12 which is also =1 whole
Then the fraction of total books that are about mammals are 7/18 x 1 whole =7/18
See related answer here: brainly.com/question/18443368
Given:
The expression is

To find:
The value of given expression when x=5.
Solution:
We have,

Substituting x=5 in the above expression, we get



On further simplification, we get




Therefore, values of the given expression at x=5 is 87.
Answer:
1. 40
2. 52
Step-by-step explanation: 1. Subtract 16 from 36 then multiply by 2
2. Subtract 4 from 472 then divide by nine