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What's the answer to 14? Math?
3 Answers
- la consoleLv 74 years ago
d: number of dimes → the value is: 5 cents → i.e. $0.05
x: number of quarters → the value is: 25 cents → i.e. $0.25
Fred has 20 coins:
d + x = 20
d = 20 - x ← answer 13)
The value is:
= (d * 0.05) + (x * 0.25)
= 0.05d + 0.25x → recall: d = 20 - x
= 0.05.(20 - x) + 0.25x
= 1 - 0.05x + 0.25x
= 1 + 0.20x ← answer 14)
- cidyahLv 74 years ago
a)
Let x be the number of quarters and y be the number of dimes
Then, x+y=20
y = 20-x
b)
0.25x+0.10y dollars
- sepiaLv 74 years ago
Fred has 20 coins.
Some of his coins are quarters and some are dimes.
If Fred has x quarters, find the following:
a.
Write an algebraic expression for the number of dimes he has.
y = 20 - x
b.
Write an algebraic expression for the value of his coins.
25x + 10(20 - x)
