Problem 11: six friends who enjoy tennis decide to play a game of singles and a game of doubles every day of the 7-week school holidays a) Show that at least four of the games of singles will be between friends playing each other for the fourth time.
b) Show at least four of the games of doubles will be between pairs playing the same opposing pair for the second time.

the reason why your question keeps getting deleted because this is not a school related question : )

i will answer your question though.

i never tried church's

let x be the money she spent so that she can earn the free t-shirt.

since, she already spent $112.49

⇒

also, as per the statement: jennifer must spend $250 or more in order to qualify for a free t-shirt at the store.

then,

we have an inequality i.,e

subtract 112.49 from both sides we get;

therefore, $137. 51 more money does jennifer need to spend so that she can earn the free t-shirt

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk