In a survey of 150 students, 70 were taking mathematics and 20 were taking psychology. a) What is the least number of students who could have been taking both courses?
b) What is the greatest number of students who could have been taking both courses?
c) What is the greatest number of students who could have been taking neither course?
ary
a) The least number of students who could have been taking both courses is
5
urces
ns

In the diagram, the measure of angle 9 is 85° which angle must also measure 85°?

The equation respenting the left table is

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.