Plz? !

a and b are complementary angles. if m a is 30°, what is the measure of b?

a: 60°

b: 150°

c: 40°

d: 90°

Plz which expression is equivalent to the expression below?

5× 1/2 = ? a) more than 5 because you are multiplying by a whole number b) 5/10 because you multiply the numerator and denominator by 5 c) less than 5 because you are multiplying by a number that is more than 1 d) less than 5 because you are multiplying by a number that is less than 1

The sum of the reciprocal of a positive number and the reciprocal of 2 more than the number is 3/4 equation: the number is