Ryans basketball team has 11 players how many different ways can his coach choose 5 starting players

Can some one me, i’ve been asking for so long

Use set builder notation to represent the following set: { -3, -2, -1, 0}

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¯¯¯¯¯¯¯¯)?