Sophia has a lemon drink made by mixing 70ml of concentrate with 180ml of water. Tommy has a lemon drink made by mixing 90ml of concentrate with 270ml of water. Who has the strongest drink, sophia or Tommy. Show your working.

Afurniture manufacturer produces chairs and sofas. each chair requires 10 yards of fabric, and each sofa requires 20 yards of fabric. the manufacturer has 300 yards of fabric available. to fulfill orders, the number of sofas must be at least twice the number of chairs. let x be the number of chairs and y the number of sofas. which inequalities are described in the problem? check all of the boxes that apply

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

Koji is installing a rectangular window in an office building. the window is 823 feet wide and 534 feet high. the formula for the area of a rectangle is a=bh. what is the area of the window? enter your answer as a mixed number in simplest form in the box. $$ ft2