The expression that show the amount of money that Marvin has after his purchase is 400 - (4d + 12r + 8c)
Amount with Martin = $40
Since he buys 4<em> dolls</em> for d dollars each, 12 <em>race cars</em> for r dollars each, and 8 coloring books for c dollars each, the total value will be:
= (4 × d) + (12 × r) + (8 × c)
= 4d + 12r + 8c
Therefore, the expression that show the amount of money that Marvin has after his purchase will be:
= 400 - (4d + 12r + 8c)
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I use a bit of a different looking formula.
A(t)=P(1+r/n)^nt
P=amount of money. (500)
r= rate (in decimal. 4%=0.04)
n=number of times per year (1 in this problem)
t=amount of time. (5 years)
Plugged in it looks like this:
A(t)=500 (1+ 0.04/1)^1x5
Then I put it into my calculator like this:
0.04/1+ 0.04
Then add one to the above answer:
0.04+1=1.04
Then raise the above answer to the 1x5:
1.04^5=1.2166......
Then multiply the above answer by 500:
1.2166.... x 500=608.3264512
She has $608 after 5 years.
Hope this helps, let me know if you have any questions.
He drank 420 cups of water in one month
Area of a circle = (3.14) * r^2
d = 7
r = 3.5
a = (3.14) * 3.5^2
a = (3.14) * 12.25
a = 38.47
