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EleoNora [17]
3 years ago
9

Find 93 • 87 using mental math.

Mathematics
2 answers:
bagirrra123 [75]3 years ago
7 0
Okay so start with multiplying 93 * 7

So 3 x 7= 21

9 X 7 +63, carry the 2 = 651


Then 8 x 93
Remember that first is a zero.
8 X 3= 24
8 X 9= 72, carry the 2= 74
So that is 7440
Now
  0651
+7440
  8091
And that's the answer
charle [14.2K]3 years ago
5 0

Answer: 8091

Step-by-step explanation:

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Answer:

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We can use the quadratic formula to find t

t = -b ± sqrt(b^2-4ac)

       ----------------------

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t = -(-15) ± sqrt((-15)^2-4(-16)139)

       ----------------------

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t = (15) ± sqrt(225+8896)

       ----------------------

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t = (15) ± sqrt(9121)

       ----------------------

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t = 15+ sqrt(9121)                       t = 15- sqrt(9121)

     --------------------   or                    -------------------  

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        -3.453247707        or              2.515747707

Since time cannot be negative

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Round to the nearest hundredth

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