These can be some values of equation
6x+ 12=30
This question might not get the right answer but this how you set equations.
For b it's 39 because you multiply 5 and 7 giving you 35 then add 4 Wich equals 39. I might be incorrect. check it out.
Answer:
45 apps
Step-by-step explanation:
1 minute has 60 seconds
If 12 seconds equals to 9 apps
60 seconds equals to x apps
Cross multiplying

Therefore, Dean downloads 45 apps in 1 minute
Answer:
b= -9
( I hope this was helpful) >;D