The sales tax for a certain state is 7%. Which of the following situations apply the correct amount of sales tax for the given amount? a A $50.00 purchase totals $53.50 with tax.

b A $700.00 purchase totals $800.00 with tax

c A $28.00 purchase totals $32.00 with tax.

d An $84.00 purchase totals $89.88 with tax.

e .A $220.00 purchase totals $214.00 with tax.

10 ! in a race, nick is 50 feet in front of jay after ten seconds. how fast can nick run, if jay can run 20 feet per second?

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. 4x^2 + 20x + 25 = 0

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.