Answer:
a= 1/2p-b
Step-by-step explanation:
p=2a+b
divide by 2 on both sides
1/2 p = a+b
subtract b from both sides
1/2 p - b = a
flip equation (not needed, just personal preference)
a= 1/2p-b
(Sorry if I didn't understand well enough and got it wrong)

So a 30 year old professor would be 2.4 standard deviations less than the mean.
Answer:
5+10d=x The dogs he walks are the ind variable and the total money he earns is the dep variable
Step-by-step explanation:
If he earns five dollars a week then that is a confirmed amount which means it’s just $5. Then for every dog he walks that’s $10 so if he walks 0 dogs then he gets $0.
The dogs he walks is ind because this variable is the variable that changes and effects the total whereas, the dep is the total because that’s what changes depending on the ind variable
$1.49 3ft or $.69 1.5ft
69*2=138
$149 for 3ft or $1.49 1.5ft
options two are better buys