ABC and DEF are complementary angels. 73, What is the measurement of x?

How can we find the measure of an exterior angle if we know the measurement of an interior angle

Dexter read 11 science fiction books and 5 history books. lena read 9 science fiction books and 4 history books. compare the students’ ratios of science fiction books to history books. 1. determine the ratios’ form:    science fiction books to history books 2. write the ratios as fractions:    dexter: 115; lena: 94 3. rewrite with a common denominator. 4. compare. 5. answer the question. determine which shows the correct comparison of the ratios for this problem.

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class