Sarah has 8 coins worth $1.40. Some of the coins are nickels and some are quarters. a. Let q = the number of quarters and n = the number of nickels. Write an equation relating the number of quarters and nickels to the total number of coins. b. Write an equation relating the value of the quarters and the value of the nickels to the total value of the coins. c. How many of each coin does Sarah have?

a.

b.

c. Sarah has 3 nickels and 5 quarters

Sep-by-step explanation:

Given

Coins = 8

Worth = $1.40

Solving (a): Equation relating to number of coins

From the question, we understand that

q = quarters

n = nickels

The required equation is:

Solving (b): Equation relating to worth of coins

So, the equation is

Solving (c): Values of q and n

Make n the subject of formula in (a)

Substitute 8 - q for n in (b)

Collect Like Terms

Make q the subject of formula

Substitute 5 for q in

Hence;

Sarah has 3 nickels and 5 quarters

days of the week

step-by-step explanation:

javier earned more money then kyle, so that won't always be a constant term, but the days of the week do not change so that term is always constant.

edit: i meant

the answer is b.

64

step-by-step explanation:

c=2πr=2·π·8≈64