What is the least common denominator of 1/4, 1/10, 1/5

What value is equivalent to 5 + [5 × (4 + 2)]? a) 35 b) 45 c) 60 d) 110

For the equations below which statement is true ? -2x=14 6x=-42

Iq scores for adults age 20 to 34 years are normally distributed according to n(120, 20). in what range does the middle 68% of people in this group score on the test?