Answer: 13
Step-by-step explanation:
You draw 13 different coloured dots and change their position
Ummmmmmmmm that is a mixed number already
Answer:
0.448 seconds
Step-by-step explanation:
d = -16t² -4t + 412
find t when d = 407
substituting d = 407 into the equation:
407 = -16t² -4t + 412 (subtract 407 from both sides)
-16t² -4t + 412 - 407 = 0
-16t² -4t + 5 = 0 (multiply both sides by -1)
16t² + 4t - 5 = 0
solving using your method of choice (i.e completing the square or using the quadratic equation), you will end up with
t = (-1/8) (1 + √21)= -0.70 seconds (not possible because time cannot be negative)
or
t = (-1/8) (1 -√21) = 0.448 seconds (answer)
Simplify 9i(2+3i):
9i×2=18i
9i×3i=27i
18i+27i
9/15
6/10
12/20
15/25
18/30
Hope this helps!! :)