1. is -7 + 9= -9 + 7 true, false, or open a. true b. false c. open 2. is 4x - 3 = 19 true, false, or open a. true b. false c. open 3. which of the following is a solution to the equation 16 = 4x - 4 a. -5 b. -4 c. 5 d. 16 4. an art student wants to make a model of the classroom. the length of the classroom is 2.4 times its width. the length of the student's model is 42 in. what should the width of the model be? a. 17.5 in b. 20.5 in c. 83.6 in d. 100.8 in 5. use mental math to determine the solution to x - 3 = 10 a. x=7 b. x=13 c. x=30 d. x=0

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.

answer: the answer is   graph (a)