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denis-greek [22]
3 years ago
6

Estimate a 15% tip on a dinner bill of $31.86 by first rounding the bill amount to the nearest ten dollars.

Mathematics
1 answer:
Masteriza [31]3 years ago
6 0
$4.5 (31.86≈30 30x0.15=4.5)
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Please help with this I’m garbage at math:/
Ronch [10]

Answer:

Thale's theorem stated that if a line parallel to the base of the triangle intersects it, the ratio of sides of the respective sides is equal

In this diagram, since the 2 horizontal lines are parallel

the ratio of the 2 sides on the left and the 2 sides on the right will be equal

Hence,

x/15 = 2/10

x = 30/10

x = 3

8 0
3 years ago
Whats the answer please
Goshia [24]
(1/9)^-2 
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5 0
3 years ago
Expansion Numerically Impractical. Show that the computation of an nth-order determinant by expansion involves multiplications,
posledela

Answer:

  • number of multiplies is n!
  • n=10, 3.6 ms
  • n=15, 21.8 min
  • n=20, 77.09 yr
  • n=25, 4.9×10^8 yr

Step-by-step explanation:

Expansion of a 2×2 determinant requires 2 multiplications. Expansion of an n×n determinant multiplies each of the n elements of a row or column by its (n-1)×(n-1) cofactor determinant. Then the number of multiplies is ...

  mpy[n] = n·mp[n-1]

  mpy[2] = 2

So, ...

  mpy[n] = n! . . . n ≥ 2

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If each multiplication takes 1 nanosecond, then a 10×10 matrix requires ...

  10! × 10^-9 s ≈ 0.0036288 s ≈ 0.004 s . . . for 10×10

Then the larger matrices take ...

  n=15, 15! × 10^-9 ≈ 1307.67 s ≈ 21.8 min

  n=20, 20! × 10^-9 ≈ 2.4329×10^9 s ≈ 77.09 years

  n=25, 25! × 10^-9 ≈ 1.55112×10^16 s ≈ 4.915×10^8 years

_____

For the shorter time periods (less than 100 years), we use 365.25 days per year.

For the longer time periods (more than 400 years), we use 365.2425 days per year.

8 0
3 years ago
A juice box contains 6 fluid ounces of juice. Maria bought a package of 10 juice boxes.
yarga [219]

Answer:

0.06

Step-by-step explanation:

8 0
2 years ago
Read 2 more answers
A line is perpendicular to y=(-1/5)×+1 and intersects the point (-5,1)
svet-max [94.6K]

hope it helps u to get your abswer and me to be ranked as brainliest:)))

6 0
3 years ago
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