Vito is picking up coffee and pastries for his friends. At a local coffee shop, each cup of coffee costs $2.50, and each pastry costs $4.00. If he buys a total of nine items at the coffee shop and spends a total of $28.50, how many pastries does he buy? Group of answer choices

He bought 4 pastries.

Step-by-step explanation:

Let x = Number of cups of coffee

y= Number of pastries.

As per given,

x+y=9            ....(i)

2.5x+4y=28.50           ...(ii)

Multiply 4 to (i), we get

4x+4y=36   ...(iii)

Eliminate (ii) from (iii), we get

Put x=5 in (i) , we get

5+y=9

y= 4

Hence, He bought 4 pastries.

step-by-step explanation:

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.