Write a real-world problem that can be solved by adding 1.39 and 2.45 using decimal models. Then solve.

Does the problem involve permutations or? combinations? do not solve. the matching section of an exam has 4 questions and 7 possible answers. in how many different ways can a student answer the 4 ? questions, if none of the answer choices can be? repeated?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

How many triangles can be drawn with side lengths 4 centimeters, 4.5 centimeters, and 9 centimeters? explain