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kirill115 [55]
3 years ago
15

Three and four please

Mathematics
1 answer:
Kipish [7]3 years ago
5 0
78% of 20 is 15.6 so you'd need to round to 16 for your estimate. and 15% of 58 is 8.7 so to leave a 15% tip they would need to leave $8.70
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Prove that 17^16+17^14 is divisible by 5
fredd [130]

We'll use the exponent rule that a^(b+c) = a^b*a^c

to break up 17^16 into 17^(14+2) = 17^14*17^2

That allows us to factor like so

17^16+17^14

17^14*17^2+17^14*1

17^14(17^2 + 1)

Computing 17^14 is a lot more difficult compared to computing 17^2 + 1, assuming you only could use paper and pencil.

Note that 17^2 = 17*17 = 289, so 17^2 + 1 = 289+1 = 290

Because 290 ends in a 0, this means that 5 is a factor

290 = 5*58

This makes 5 to be a factor of the original expression.

----------------

So overall,

17^16+17^14 = 17^14(17^2 + 1) = 17^14*290 = 17^14*5*58 = 5*17^14*58

The stuff "17^14*58" doesn't matter. All we care about is that factor of 5.

Since 5 is a factor, this means that 17^16+17^14 is a multiple of 5, or 17^16+17^14 is divisible by 5.

Phrased another way, 17^16+17^14 all divided over 5 leads to some integer. In this case, the integer would be the result of 17^14*58.

6 0
3 years ago
Can someone please tell me this?
Phantasy [73]

Answer:

it is c

Step-by-step explanation:

brainly plz

7 0
4 years ago
Given g(x) = x^2 - x, find g (2/3).
ValentinkaMS [17]

Answer:

Step-by-step explanation:

g(x) = x^2 - x

g(2/3) = (2/3)^2 - 2\3 = 4/9 - 2/3 = 4/9 - 6/9 = -2/9

7 0
3 years ago
Read 2 more answers
Going against the current, a boat takes 6 hours to make a 120-mile trip. When the boat travels with the current on the return tr
tankabanditka [31]

Answer:

  22 miles per hour

Step-by-step explanation:

Against the current, the boat's rate of travel is ...

  (120 mi)/(6 h) = 20 mi/h

With the current, the boat's rate of travel is ...

  (120 mi)/(5 h) = 24 mi/h

___

The sum of boat speed (b) and current speed (c) is 24 mph. The difference is 20 mph. This lets us write the equations ...

  b + c = 24

  b - c = 20

Adding these two equations together, we get ...

  2b + 0c = 44

  b = 22 . . . . . . . . divide by 2

The rate of the boat in still water is 22 miles per hour.

5 0
4 years ago
You need at least 5000 points to earn a gift card from your bank. You currently have 2700 points.
steposvetlana [31]

Answer:

x + 2700 ≥ 5000 → x ≥ 2300

Step-by-step explanation:

The inequality is: x + 2700 ≥ 5000 with x being the number of points

To solve we need to subtract 2700 from both sides to get: x ≥ 2300

5 0
3 years ago
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