PLEASE HELP ME !! Miranda had a collection of 800 nutcrackers given to her by her grandmother every Christmas. Of these nutcrackers, 20% were dated before she was born, 15% are dated from 1991 to 1999, and the rest are dated after 1999. How many nutcrackers are in Miranda’s collection are dated after 1999?
answer choices:
160
750
120
520

Me with geometry ! in this figure, bc is a perpendicular bisects of kj. dm is the angle bisects of bdj. what is the measure of bdm? •60° •90° •30° •45°

Can someone me with these two circle theorem questions asap?

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?