3 years ago

Estimate. Divide using the standard algor ithm and check.

Mathematics

1 answer:

KatRina [158]3 years ago

8 0

image?????? im not sure

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The sum of two numbers is 18 and the difference is 8

Andrews [41]

Answer:

x = 13 and y = 5

Step-by-step explanation:

x + y = 18

x - y = 8

Step 1: Find y

x = 18 - y

(18 - y) - y = 8

18 - y - y - 18 = 8 - 18

-2y / -2 = -10 / -2

y = 5

Step 2: Plug into x + y = 18 to get x

x + 5 - 5 = 18 - 5

x = 13

Answer: x = 13 and y = 5

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Ainat [17]

225 3x5 is 15 and to the power of 2 is 15x15 so multiply and you get 225 hope it helps

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How many five-card hands (drawn from a standard deck) contain exactly three fives? (A five-card hand is any set of five differen

VashaNatasha [74]

Answer:

4512.

Step-by-step explanation:

We are asked to find the number of five-card hands (drawn from a standard deck) that contain exactly three fives.

The number of ways, in which 3 fives can be picked out of 4 available fives would be 4C3. The number of ways in which 2 non-five cards can be picked out of the 48 available non-five cards would be 48C2.

$4C3=\frac{4!}{3!(4-3)!}=\frac{4*3!}{3!*1}=4$

$48C2=\frac{48!}{2!(48-2)!}=\frac{48*47*46!}{2*1*46!}=24*47=1128$

We can choose exactly three fives from five-card hands in $4C3*48C3$ ways.

$4C3*48C3=4*1128=4512$

Therefore, 4512 five card hands contain exactly three fives.

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3 years ago