Isaac has 10 coins in a bowl. There are 4 quarters, 3 nickles, and the rest are pennies. Without looking, he grabs one coin, puts it back, and then grabs another coin. What is the probability that both coins he grabs are quarters?
4/10*4/10 = 16/100 = 4/25 Is this the correct way to solve this problem?
3/25
2/15
4/25
16/49

Aboat's value over time is given as the function f(x) and graphed below. use a(x) = 400(b)x + 0 as the parent function. which graph shows the boat's value increasing at a rate of 25% per year?

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.

In dire need~! describe how to use area models to find the quotient 2/3 divided by 1/5. check your work by also finding the quotient 2/3 divided by 1/5 using numerical operations only.