Alex was thinking of a number. Alex adds 9.8 to the number, then doubles the result to get an answer of 90.9. Form an equation with x from the information.

2(x+9.8)=90.9

Step-by-step explanation:

let's represent the number with x.

9.8 is added to x, and then that is doubled to get 90.9.

therefore, we put x+9.8 in parenthesis and then multiply that by 2 since it says that the result of x+9.8 was doubled. we set that equal to 90.9 since it's stated that the result of 2(x+9.8) is equal to 90.9

2(x+9.8)=90.9

step-by-step explan mxfcg'k; uafwgzfgjhklhgation:

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.