Sig Figs
How many significant figures are in 24.5
3
Solve:
6/13 = 93/T
T= 201.5
Find the unit rate:
$125/5 packages
Each package is worth $25
The table gives the cost of using a computer per hour at the cafe. Are the costs in proportion?
Cost 3 4 5 6 7 8 9
Time* 1 2 3 4 5 6 7
* per hour
No, it is not proportional.
What is 2+2
4
How many significant figures 24.50
4
Solve:
8/1.5 = 37/K
Solve to the nearest hundredths
K=5.32
Find the unit rate.
$6 for 30 envelopes
0.20 for each envelope
Is this equation proportional?
y= x + 2
y
x -3 -2 -1 0 1 2
No, the variables are not in direct proportion.
How do we determine a leap year?
That year has 1 extra day, February 29.
How many sig figs are in 340
Solve:
7/16=143/x
solve to the nearest hundredth
x=approx. 326.86
Find the unit rate (hint: per hour)
$1.37 for 1/2 hour
$2.74
Is the following a direct variation?
y=3x
y
x -3 -2 -1 0 1 2 3 4
Yes. This is a direct variation.
What is the largest continent?
Asia
How many sig figs are in 5,002.90
6
Solve:
15/32 = 67/M
solve to the nearest tenth
M=142.9
Find the unit rate. (hint: per minute)
2 1/2 inches per 4 min.
5/8 inch per minute
Is this equation a direct variation?
y=-x
y
x -3 -2 -1 0 1 2 3 4
Yes, this is a direct variation.
Who developed the Theory of Relativity?
Albert Einstein
How many sig figs are in 15000
2
7/146 = 38/S
Solve to the nearest tenth
S= 792.6
Mario can ride his bike 35 km in 1 1/2 hours. What is the unit rate.
70/3 km/h = 23 1/3 km/h
Is this equation a direct variation?
y= -2x + 1
y
x 7 5 3 1 -1 -3 -5 -7
No, this is not a direct variation.
Who discovered the Law of Gravity "when an apple fell on his heard?"
Sir Issac Newton