3 identical circles of radius 21cm are connected at their centres as shown below find the area of the shaded region (50 points)​

Problem melissa is her dad build a walkway in their backyard. the walkway will be 54 feet long and 1.5 feet wide. the local hardware store sells tiles which are 1.5 by 1.5 feet and come in boxes of 12. how many boxes of tiles do they need?

Kathy spent 5/8 of her money on books and another 1/6 of her money on stationeries.what fraction of kathy’s money was left?

Solve x+3y=6 and 4x-6y=6 by elimination . show work !