Marco sells hand-decorated clothing online. He charges $15 for each t-shirt and $25 for each sweater. During a two day period, a total of 63 t-shirts and sweaters were sold, the total sales was $1175. If solved correctly which of the following systems of equations yields the number of t-shirts, x, and the number of sweaters, y, that were sold during the two days?

When turned about its axis of rotation, which shape could have created this three-dimensional object?

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

Saline iv fluid bags cost $64.20 for 24, 1000 ml bags from one supplier. a new supplier sells 500 ml bags for $2 each. the hospital uses about 10,000, 1000 ml bags each month. nurses report that about half of the bags are more than half full when they are discarded. if you are going to use only one supplier, which size bag provides the best deal, and how much will you save each month? compare the cost of the new supplier to the current one.