Joe has a collection of nickels and dimes that is worth $5.95. If the number of dimes were doubled and the number of nickels were increased by 9, the value of the coins
would be $10.80. How many dimes does he have?

-7/8

step-by-step explanation:

instead of subtracting you add the -6/8 and -1/8

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.

you need to rotate this triangle about the origin 270 degrees clockwise to create the full square.