P = 2(l+w)
200 = 2(l+w)
divide by 2 on each side
100 = l+w
let the length = x
100 = x+w
solve for w but subtracting x from each side
100 -x = w
A= l*w
we know l =x
substitute for w because we found w above 100 -x = w
A = x * (100-x)
distribute
A = 100x - x^2
10. if A = 2400
2400 = 100x-x^2
subtract 100x from each side
2400 -100x = 100x-x^2 -100x
2400 -100x = -x^2
add x^2 to each side
2400-100x^2 + x^2 = -x^2 + x^2
x^2 -100x+2400 =0
factor
(x-60) (x-40) = 0
using the zero product property
x-60 = 0 x-40 = 0
x=60 x=40
If x=60 then 100 -x = w 100-60 = w w=40
If x=40 then 100 -x = w 100-40 = w w=60
The dimensions are 60m by 40 m
Answer:
what is the multiple choice how old is arif
Step-by-step explanation:
If the gum costs 75 cents today, which is 3 cents less than three times what the pack cost 20 years ago, we just need to arrange what we know into an equation.
We know that the price of gum today is 75 cents, so we can leave that on one side of the equation as a constant. Also, since we are dealing only with cents and not dollars, there is no need to shift the decimal point to the left.
? = 75
Now, we can work the equation.
The problem tells us that 75 is 3 cents less than three times the old cost. So, if x is the old cost, we can work out the equation based on that.
It says that it's 3 cents less than 3 times x. The question is basically the equation in word form.
3x - 3 = 75
'3x' being the "three times the old cost" part, '- 3' being the "3 cents less" part, and '75' of course being the current price of a pack of gum.
Option C is your correct answer.
BTW if we were to solve this, we would see that the old price of a pack of gum is:
3x - 3 = 75
+ 3 + 3
3x = 78
/3 /3
x = 26
20 years ago, a 75-cent pack of gum cost 26 cents.
Hope that helped! =)
Answer:
11.8
Step-by-step explanation:
Rounding 59.03 you get 59.
20% of 59 = 11.8
11.8 = the tip.
