50 points How many 4-digit decimal numbers have at least a 7, an 8, and an 9? Not an 8,9, or 7, the 4 digit number must contain all 3 in it's digits.

Number of 4 digit numbers(0–9) with at least one digit repeated=(Total number of possible 4 digit numbers) - (Total number of 4 digit numbers having no digit repeated) Total 4-digit numbers possible-

Step-by-step explanation:

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r3t40

g = (2, 2)

step-by-step explanation:

given the ratio is 1 : 1 then f is the midpoint of eg

let the coordinates of g = (x, y)

using the midpoint formula

(0 + x) = 1 ( multiply both sides by 2 )

0 + x = 2 ⇒ x = 2

similarly

(4 + y) = 3 ( multiply both sides by 2 )

4 + y = 6 ( subtract 4 from both sides )

y = 2

coordinates of g = (2, 2)