Which one of the following statements expresses a true proportion?
a. 3: 4 = 9: 12 b. 54: 9 = 6: 3 c. 2: 1 = 1: 2 d. 7: 9 = 8: 9

Acompany that manufactures and sells guitars made changes in their product range. from the start they had 20 models. then they reduced the number of models to 15. as a result, the company enjoyed a 10% increase in turnover. - how much did the stock level change? in (%)

Item 1 solve for s. s+24=90 −114 −66 66 114

Amountain climber starts a climb at an elevation of 453 feet above sea level at his first rest stop he has climbed 162 feet and by his second rest stop he has climbed another 207 feet its getting late in the day so the climber starts his way down if the climber desends 285 feet how much does he need to ascend or descend to return to the original starting point