Answer:
Answer is B
Step-by-step explanation:
If point D with coordinates (a,b) is reflected over the line y=x then the image point D' coordinates are (b,a) (see picture for details).
The middlepoint M of segment DD' lhas coordinates and lies on the line y=x (since its coordinates are equal), DD' is perpendicular to the line y=x and DM=D'M. All these remarks show that the point D' is the image point of D.
Slope formula : slope = (y2 - y1) / (x2 - x1)
(2,3)...x1 = 2 and y1 = 3
(4,2)... x2 = 4 and y2 = 2
now we sub and solve
slope = (2 - 3) / (4 - 2) = -1/2 <==
to vertically shrink a function by a factor of c, multiply the whole function by c
f(x) vertically shrunk by a factor of c would be cf(x)
so f(x)=-3|x-4| vertically shrunk by a factor of 1/2 would be
Answer: 21 degrees
Step-by-step explanation:
In the evening, the temperature is 28 degrees and by midnight it has dropped 31 degrees lower, the temperature by midnight will be:
= 28° - 31°
= -3°
Between midnight and 4 am it goes down 6 more degrees. The temperature by 4am will be:
= -3° - 6°
= -9°
Then, by 9 am, the temperature goes up 30 degrees, the temperature at 9 am will then be:
= -9° + 30°
= 21°
