The base area of a right circular cone is 346.5 cm² and its height is 13 cm. What would be the total surface area if the radius is halved and the height is doubled? What is the volume of the new cone formed?

What is the nth term rule of the linear sequence below? 27 , 25 , 23 , 21 , 19 , . .

Agrain trader buys the following amounts from three suppliers: 3,200 pounds, 5,100 pounds and 700 pounds. what is the total weight of his purchase?

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?