<p>Hi, for 1, this is how i did it.
continue and you get 2,-4,8,-16,32,-64. That’s 6 numbers less than 10, and the first 6 of the 50 terms. there’s 44 left, and half of those will be negative = less than 100. so 44/2 = 22. 22+ the first 6 = 28. C</p>
<p>For 2:
volume = 8 so 1 side is 2cm since v= s^3
using 3d geometry the 2nd side is 2 radical2, use pythagorean to find the diamater of the sphere and you get 2 radical 3</p>