Answer:
1 toast costs $0.30 and 1 egg cost $0.60
Step-by-step explanation:
Let price of 1 egg be
and price of 1 toast be 
<u>"$1.50 for 2 eggs and one piece of toast":</u>
We can write 
<u>"$.90 for one egg and one piece of toast":</u>
We can write 
Now, we can solve the first equation for t and substitute that into 2nd equation and solve for e:

Now using the value of e (0.6) and putting it back in the first equation, we will get t:

Hence, 1 toast costs $0.30 and 1 egg cost $0.60
19. $30,681.82
20. Find surface area for this one
21. Use geometry
<span>The sample proportion of the the students that took fewer than the mean number of electives is given by the number of people who took less that the mean number of electives (i.e. 7.63) divided by the total number of students in the sample (i.e. 19).
The total number of people who took less than 7.63 electives is 10.
Therefore, the required sample proportion is 10 / 19. </span>