The product of 9 and a numberInto mathematical expression

9x

Step-by-step explanation:

Let the number be x.

9x

Step-by-step explanation: Well, you said the product of 9 and a number. It doesn't matter which. So you're basically multiplying 9 with a variable that could be ANY possible result and end up with any possible product. So 9x = Either way, you could do it however you want.

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.