7diminished by one-fourth of a number is 15 find the number

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

What is the distance between the points (2, 5) and (5,9)?

Which is a logical conclusion based on the given information? a. figure abcd is a rhombus by the definition of a rhombus. b. segment ac is congruent to segment dc by cpctc. c. angle acb is congruent to angle adc by the angle-side-angle theorem. d. triangle acd is congruent to triangle cab by the hypotenuse-leg theorem.