Answer:
See attachment
Step-by-step explanation:
The given parametric equations are;
and 
, 
.
We can graph this by plotting some few points within the given range or eliminate the parameter to identify the type of curve.
Plotting points;
When 
,
and 
This gives the point (-4,3).
When 
and 
This gives the point (0,5).
When 
and 
This gives the point (6,8).
We plot these points and draw a straight line through them.
Eliminating the parameter.
Make t the subject in the second equation;
Substitute into the first equation;
This implies that;
This is an equation of a straight line with slope 
and y-intercept 5 on the interval
The unit rate would be the price for 1 ticket.
12 dollars / 3 tickets = $4 per ticket.
The ratio would be 4:1
336 / 3 =
(24<span> * 3 * 7) / 3 = </span>
((24<span> * 3 * 7) : 3) / (3 : 3) = </span>
<span>(336 : 3) / (3 : 3) = </span>
<span>112 / 1 = </span>
<span>112</span>
Answer:
1 x 10 13
Step-by-step explanation:
N=NOe^-kt
N=mass at time t
NO = initial mass
k= 0.1476
t= time, in days
We are asked to find the half-life, which means you want to find how long it will take for half of the substance to decay/disappear (depending on situation).
If we are looking for half-life, we can simply set N to half of NO (which we are given a value of 40grams for)
Therefore:
N = 20
NO = 40
plugging these values and the value given for k back into the equation you get:
20 = 40e^-0.1476(t)
We are looking for t, so we have to manipulate the formula to get t by itself on one side of the equation.
We can start by dividing 40 from both sides, and you get:
0.5 = e^-0.1476(t)
We have the exponential function "e".
To get rid of e, we can use natural log (ln)
if e^y=x then ln (x) = y
look back at our equation we can set
0.5 = x
-0.1476(t) = y
Rewriting it in natural log form:
ln (0.5) = -0.1476(t)
Plug in ln (0.5) on a calculator to find its value and we get:
-0.693147 = -0.1476(t)
*Note: normally, getting a negative value would suggest that we did something wrong, because you cannot have a negative value as your t (you cannot have negative days), but because there is a negative on both sides of the equation, they will cancel out in this case.
The last step is to simply divide both sides by -0.1476
therefore:
T = 4.696119
But it asks you for the answer to the nearest tenth (one place after decimal pt) so
T (half life) = 4.7 days
Hope that helps :)
