Write a whole number that rounds to 10,000 if we are rounding to the nearest ten thousand

Which point on the x-axis lies on the line that passes through point c and is parallel to lino ab?

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¯¯¯¯¯¯¯¯)?

What is the lcm of 16 and 40 ? 24 and 40 ?