Solve 2cos2x+1=0 on interval [0,2pi]

How many grams must be adde to 970g to make 1 and a half kg

Alength on a map is 7.5 inches. thescale is 1 inch: 5 miles. what is theactual distance? a 1.5 miles c 12.5 milesb 2.5 miles d 37.5 miles

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?