Wes is 4 years older than his sister. Let x be his sister's age. Write an expression that tells how old Wes is.

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?

In what organelle does photosynthesis take place?

In a right triangle δabc, the length of leg ac = 5 ft and the hypotenuse ab = 13 ft. find: b the length of the angle bisector of angle ∠a.