In the formation of the four basic conics, the intersecting plane

Mathematics

1 answer:

Damm [24]4 years ago

5 0

Answer:

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The sum of all the digits of the integers from 18 to 21 inclusive is 24 (1+8 + 1+9 + 2+0 + 2+1 = 24). What is the sum of all the

blondinia [14]

Answer:

$R=900$

Step-by-step explanation:

You can add all the digits one by one, or count how many of each digit you have in total, for example: how many digits one are in the digits of the integers from 0 to 99:

First, the ones that are in the units: 1,11,21,31,41,51,61,72,81,91, there are 10 in total (not counting the digit one in the decimals in 11).

Then the ones that are in the decimals:

10,11,12,13,14,15,16,17,18,19 they are 10 in total (not counting the digit one in the units in 11).

This means they are 20 digit ones in total. And is the same for the twos, the threes, etc. The sum of all will be:

$R=20*1+20*2+20*3+20*4+20*5+20*6+20*7+20*8+20*9\\$

Factorizing:

$R=20(1+2+3+4+5+6+7+8+9)=20(45)=900$

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4 years ago

Carla currently has $209 and plans to save an additional $14 each week to buy a tablet. She made a table showing the total amoun

Vladimir [108]

the equation is total money saved = 209+14x

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4 years ago

Read 2 more answers

In the diagram, DG I EF

Anuta_ua [19.1K]

Answer:

a) DE ≅ GF

Step-by-step explanation:

In the picture attached, the diagram is shown.

An isosceles trapezoid is a trapezoid in which the base angles are equal and therefore the left and right side lengths are also equal. In this case, the left and right side lengths are DE and GF, respectively; then they are congruent.