Percent Change = (new quantity - old quantity) / old quantity
#2:
(64 - 52) / 52
12 / 52
0.2308
23%
#4:
(12 - 18) / 18
-6 / 18
-0.33
33% decrease
#5:
(10 - 16) / 16
-6 / 16
-0.375
38% decrease
Hope this helps! :)
Answer: exponential decay (choice B)
The variable x in the exponent tells us that this is an exponential function. The fact that the base 1/2 = 0.5 is between 0 and 1 indicates that the value of y will decay or get smaller as x increases. Visually, it graphs out a curve that goes downhill as you read from left to right.
side note: The function f(x) = 7*(1/2)^x can be written as y = 7*(0.5)^x. It has a horizontal asymptote of y = 0 meaning that the curve will get closer and closer to the x axis, but never actually touch it.
Answer:
$9.75
Step-by-step explanation:
A store is having a sale on walnuts and chocolate chips. For 3 pounds of walnuts and 5 pounds of chocolate chips, the total cost is $16. For 6 pounds of walnuts and 2 pounds of chocolate chips, the total cost is $22
. Find the cost for each pound of walnuts and each pound of chocolate chips.
***
let x=cost/lb of walnuts
let y=cost/lb of chocolate chips
..
3x+5y=16
6x+2y=22
..
6x+10y=32 (mult. eq by 2)
6x+2y=22
subtract:
8y=10
y=10/8=1.25
x=16-5y=9.75
cost/lb of walnuts=$1.25
cost/lb of chocolate chips=$9.75
C is your answer, you tell without solving
