9/28/2016
Prebell
Which equation(s) has (have) exactly one
solution?
A. 𝑥 − 1 = 3 + 𝑥
B. 2𝑥 = 4𝑥 − (2𝑥 + 3)
C. 3𝑥 − 2 = 2𝑥 − 3
D. 4𝑥 + 𝑥 = 𝑥
E. 5𝑥 − 𝑥 = 4𝑥
Review
Classify in as many ways
as possible.
1. 14.904
2.
74 = 8.602325267 …
6.
1 2
𝑥
2
2
3
+ =
8
9
−49
3. −
28
4
4. − 225
5.
78
3
Estimating Square Roots
• We can use our knowledge of perfect squares
to estimate irrational numbers.
Solve.
Non-perfect Squares
• What number would we need to square to
equal 11?
• How could we estimate this number?
• Between which two perfect squares would
you find 11?
•
11 is between the
•
11 is between the roots _____and _____.
and
.
Find the value of each square root. If
it is not a whole number, tell what two
numbers it is between.
361
81
67
128
32
225
54
289
265
196
324
175
154
So 154 must be between ______ and ______.
1
9/28/2016
Decimal Expansion
2
9
Change 15 to a decimal.
• In order to compare or order numbers, we
need to change them all to decimals first.
• To change a fraction to a decimal, we have to
divide the numerator by the denominator.
Ex:
9
11
is equivalent to 9 ÷ 11
Change 6 5 to a decimal.
Estimate 245. Write your answer as
a decimal. Round to the nearest tenth.
Estimate 72. Write your answer as a
decimal. Round to the nearest tenth.
Compare 5 9 and 30.
4
2
2