Help with this please

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list

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.

Isaac wants the equation below to have no solution when the missing number is placed in the box. which number should he place in the box?