Answer: 1st one
Step-by-step explanation:
Answer:
$10 coins: 21
$20 coins: 24
Step-by-step explanation:
heyy me again
So we can create 2 equations where
x = number of $10 coins
y = number of $20 coins:
x + y = 45
10x + 20y = 690
we can move equation 1 around so that we can get a value of x
x = 45 - y
now we can substitute x into the second equation
10(45 - y) + 20y = 690
450 - 10y + 20y = 690
10y = 240
y = 24
Now plug in y back into the first equation
x = 45 - y
x = 45 - 24
x = 21
We have
To simplify it we can divide numerator and denumerator by the same number (the greatest possible is the best)
- its the simples form..
Subtract 6 from both sides, you get 1/3x=-14
Now multiply both sides by there, hence x=-42
Answer:
A dictionary has the mass of about 1 killo so the book!
Step-by-step explanation:
