Warm-UP
Solve this proportion:
x + 10
10
=
18
12
2.5 2.6 2.7
Review
The ratio of the number of bones in the
human skull to the number of bones in the
ears is 11:3. There are 22 bones in the skull.
How many bones are in the ears?
Ralf Laue of Germany flipped a pancake 416
times in 120 seconds to set the world record.
Find the unit rate. (round to hundredths)
A contractor has a blueprint for a house
drawn to the scale 1 inch: 5 feet.
A wall on the blueprint is 6.5 inches long.
How long is the actual wall?
One wall of the house will be 12 feet
long when it is built. How long is the
wall on the blueprint?
Solve the proportions
2
3
=
6
x-4
9
2
=
5
x+1
a
2
=
a-4
30
Find the value of x in each diagram
ABC
5 cm
A
DEF
B
9 cm
x
C
A
5
B
4
D
x
D
15 cm
ACD
8
E
E
C
F
ABE
A 4 by 5 inch photo is enlarged by
multiplying every dimension by 2 to form
a similar 8 by 10 inch photo.
What is the ratio of the perimeter of the
smaller rectangle to that of the larger?
What is the ratio of the two areas?
Solve the equation for y:
5x + 8y = -16
Solve the equation for y:
-6x - 8y = 10