What equation is described below?

42 is 2 times as many as 21

Possible Answers:

21*2=42

42*2=21

42*2=21

21*2=42

42:2=21

The amount of caffeine in the body of a healthy adult after drinking espresso decreases exponentially, with half-life of approximately 6 hours. That is, every 6 hours, the amount of caffeine in the body decreases by 50%.

Maria and Nina each ordered a small pizza. Maria ate 3/8 of her pizza. Nina ate 3/6 of her pizza. Who ate more pizza?

What is the remainder when 3x^2-x-10 is divided by x-1 -6,-7,-8, or - 9

Each month, a shopkeeper spends 8 x plus 15 dollars on rent and electricity. If she spends 3 x minus 7 dollars on rent, how much does she spend on electricity? Use pencil and paper.

The expression 4x^2represents (4) (x) (x) (4x) (4x) (4) (x) (2)

How do you solve 1650:55

Shirts are $9 each. You have a coupon that saved you $5 off your purchase. How much will it cost you to buy 6 shirts?

8 to the fourth power increased by 6 in an algebraic expression.

Find the length of time fo $500 to be the interest on $1800 at 6% p. a

Alaina has $28 in her account. She wants to purchase a pair of shoes that costs $45. If Alaina makes the purchase, which integer will represent the amount of money in Alaina's account A. - 73 B. - 27 C.-23 D-17