Willl give a brainlesst and 50pts factor t12 – r3s15. a. (t4 – rs5)(t8 – rs5t4 – r2s10) b. (t4 – rs5)(t8 + rs5t4 + r2s10) c. (t9 – rs12)(t18 + rs12t9 + r2s24) d. (t4 + rs5)(t8 – rs5t4 + r2s10)

She colored 30 yellow place value disks and 50 disks are left to color.

Step-by-step explanation:

Let total number of disks be x.

It is given that, she colored 2/6 of the disks red. She colored 1/4 of the disks yellow.

She colored 40 red place value disks.

It means total number of disks is 120.

So, she colored 30 yellow place value disks.

Remaining disks = Total disks - Red disks - Yellow disks

Therefore, 50 disks are left to color.