Which numbers are perfect cubes? 1, 3, 6, 8, 21, 64

1,8,64

Step-by-step explanation:

if you prime factor them you can see if they are perfect cubes

so 1, 1 to the anything is still 1 so 1 so ✅

for 3, 3 is a prime number so ❌

For 6, 6 is 2(3) that’s not a perfect cube so ❌

For 8, 8 is. 2³ so 8✅

for 21 3(7) thats not a perfect cube so ❌

for 64, 64 is 4³ so ✅

so the one that’s are perfect cubes are

64,8,1

x= -3

step-by-step explanation:

step 1: simplify brackets

4 - x - 1 = 6

step 2: simpilfy

3 - x = 6

step 3: subtract 3 from both sides

-x = 6 - 3

step 4: simpilfy 6 - 3

-x = 3

step 5: multiply both sides by -1

x = -3