please help on numbers 7-11 im having a lot of trouble thank you! had to fix it the image did not show up!​

6x - 8 = 16 solve the following equation. then place the correct number in the box provided.

Aquantity with an initial value of 3900 decays exponentially at a rate of 35% every hour. what is the value of the quantity after 0.5 days, to the nearest hundredth?

When keisha installed a fence along the 200 foot perimeter of her rectangular back yard, she left an opening for a gate. in the diagram below, she used x to represent the length in feet of the gate? what is the value? a. 10 b. 20 c. 25 d. 30