Reginald wants to buy a new collar for each of his 3 dogs. The collars come in a choice of 7 different colors. Step 1 of 2 : How many selections of collars for the 3 dogs are possible if repetitions of colors are allowed?

343

Step-by-step explanation:

Repetition allowed so 7 options for all dogs

7C1 × 7C1 × 7C1 = 343

answer

d. 10

explanation

the distance from point y to wx is the height of the triangle.

using pythagoras theorem,

group similar terms to get,

this implies that,

take positive square root of both sides to get,

this implies that,

you didn't give me the choices, so i will just give you the graph so you can look at your choices and choose the right one.