You purchase a drink and a sandwich for $4.50. your friend purchases a drink and five sandwiches for 16.50. you want to determine the price of a drink and the price of a sandwich

The cost of 1 drink   = $0.50

The cost of 1 sandwich  = $4

Step-by-step explanation:

Let the cost of 1 drink = $x

and The cost of 1 sandwich = $y

⇒The The cost of 1 drink + 1 sandwich  =  $x + $ y   = $4.50

or,  $x + $ y = $4.50

or, x + y = 4.50

Also, The The cost of 1 drink + 5 sandwich  =  $x + ($ y)5    =  $16.50

                                                                        or,  x + 5y   =  16.50

⇒   x + 5y = 16.50

Hence, the given system of equations is:

x + y = 4.50

x + 5y = 16.50

Subtract (2) from (1), we get

x + y - (x+ 5y) =  4.50 -  16.50

or, -4y = -12

or, y =  12/4  = 3

Hence, the cost of 1 sandwich  = $4

Now, x + y = 4.50

⇒   x = 4.50 - y = 4.50 - 4  = 0.50

or, x  = 0.50

Hence, the cost of 1 drink   = $0.50

15%

step-by-step explanation:

use the table and count the number of guesses that has two correct answers.

the following are two correct answers

10010, 01100, 11000

a total of 3 numbers having 2 correct guesses out of 20 questions.

probability of getting 2 correct guesses = the number of questions getting 2 correct answers / total number of questions.

= 3/20

to convert it into percent multiply by 100, we get

= 3/20 * 100

= 15%

the answer is 15%

you.

14.3

step-by-step explanation:

add all the numbers together.

9 + 12 + 15 + 16 + 17 + 17 = 86

now, divide 86 by how many numbers we have: 6.

86 / 6 = 14.3