(2 mark) A group of 10 friends are planning to a trip. You are responsible for the flight tickets. You searched on the Internet and you found a flight with four different classes. Economy class (100$) has only four available seat, First class (150$) has only 2 available seats, Business class (200$) has only 3 available seats, and Premium class (300$) has 5 available seats. Your budget is limited and you want to save as much as you can. In how many ways you book the tickets?​

4 seats economic, 2 seats first class, 3 seats business class, 1 seat premium class

Step-by-step explanation:

4 \times economy class = 400$ +

2 \times first class = 300$ +

3 \times bussines class = 600$ +

1 \times premium class = 300$

= 1600$

This is the way to spend the least money if everyone is seated on one seat.

b. an equilateral triangle inscribed in a circle

step-by-step explanation:

we are given the figure of two circles having a triangle inside.

now, we know that,

"when a figure is lying inside an another figure, then the outside figure is known as circumscribed figure and the figure lying inside is referred to as the inscribed figure".

as we see that, the circles are containing the triangle completely.

thus, the circles are the circumscribed figures and the triangle is the inscribed figure.

hence, we get, 'an equilateral triangle is inscribed in a circle'.