Very confused, do not understand how to complete these 2 questions properly.

11) tan(7x+3) = OE/OJ

7x+3=arctan(OE/OJ)=45

x=6

12) a) x = 40

<ajq = <acq (base angles of isosceles triangle)

50+x+90=180

x=40

b) they are congruent triangle, reason HL   (hypotenuse, leg)

aj=ac

aq=qa

right angle equal

d (5 x (-20)) * (100 x (0.7))

step-by-step explanation:

5÷1/100 * -.7 *-20

copy dot flip

5*100 * -.7 *-20

rearrange

5*-20   * 100 *-.7

-100   *-70

7000