8m - n + 3 ; n = 9 m=-9

=-78

part 1) the new dimensions are

base=7.875 cm and height=21.25 cm (see the attached figure)

part 2)   the actual dimensions are

base=1.575 m and height=4.25 m

step-by-step explanation:

step 1

find the actual dimensions of the figure

we know that

to find the actual dimensions divide the dimensions on the scale drawing by the scale

the scale is 4 cm/m

base=6.3/4=1.575 m

height=8.5/4=4.25 m

step 2

make a new scale drawing of this rectangular figure using the scale 5 centimeters = 1 meter

to find the new dimensions on the scale drawing multiply the actual dimensions of the figure by the scale

base=1.575*(5)=7.875 cm

height=4.25*(5)=21.25 cm

see the attached figure of the rectangular figure with the new dimensions