algebra- Please help
posted by deedee .
10)The formula b=30a is used in New England to estimate the minimum furnace output, b, in BTU's for a modern house with a square feet of flooring.
A) determine the minimum furnace output for a 2100 ft squared modern house.
B) solve formula for a
b) unsure how to calculate
24)Translate the phrase into an algebraic expression.
Justin had $36 dollars before spending d dollars on jeans. How much money remains?
The translation is $_____
Answer: how can that even be calculated? There is not enough info
7)use cummutative law to find and equivalent expression
answer: I don't even know where to start with this one
32xy over 56x
Answer:? no clue