Solving variables? b+a=20 I have to solve for b I do not understand this

What is the sale tax of a sweater for 36$ and a 7% sales tax

Write 0.000000657 * 10^15

Y=X^2-6 test for symmetry

G (x) = x2 + 3, what is the change made to g (x) if the parent function is f (x) = x2? Yeah totally stumped here.

A surveyor wants to know how many shoppers at a mall like to read books. He surveys 100 people coming out of a bookstore at the mall. Why is the sample biased? A. There are not enough people in the sample. B.

Find the quotient of ' (16t^2-4) / (8t+4) '

The Science Club has 35 members, 10 girls and 25 boys. What is the ratio of girls to boys in the Science Club? A. 2:1 B. 2:5 C. 5:2

The cost of petrol rises by 2 cents a liter. last week a man bought 20 liters at the old price. This week he bought 10 liters at the new price. Altogether, the petrol costs $9.20. What was the old price for 1 liter?

1. Which equation represents the linear graph? A) y = 2x - 4 B) y = 2x + 4 C) y = 4x - 2 D) y = 4x + 2

Mary has $500 in her account. She makes a $350 withdrawal, deposits $100, and then gets charged a $20 fee. How much does she have in her account? A) $180 B) $230 C) $290 D) $340