I watch Khan Academy and in this video(https://www. khanacademy. org/math/pre-algebra/pre-algebra-ex ponents-radicals/pre-algebra-comput ing-scientific-notation/v/scientifi c-notation-example-2?modal=1) Sal said Scientific Notation have to be a * 10^n, and a have to be larger or same as 1, and It has to be less than 10. Then, Is 0.0036 x 10^4 is scientific notation?

true !

step-by-step explanation:

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500

answer: the answer is d

one fourth of 9% = 2.25%

gavin is correct in saying : the equivalent quarterly interest rate would be

2.25%.