1. 650 - 700 - 800 = ?2. 25 - 45 + 23 ＝?
2 answers:
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We will use PEMDAS rule to simplify the given expression.
PEMDAS rule is given by:
P
-Parentheses first
E
-Exponents (ie Powers and Square Roots, etc.)
MD-Multiplication and Division (left-to-right)
AS
-Addition and Subtraction (left-to-right)
Step 1: P-parenthesis first.
(3-9) is -6
√16 -1 = 4-1 =3
So new expression becomes :
Step 2:
Multiplying (-3)*(-6)*2
We get +36
So new expression becomes : 25 +36
Step 3: Addition
Adding 25 and 36 we get 61
So final answer is 61 .
Answer:
Step-by-step explanation:
using the 30- 60- 90 triangle for exact values , then
tan60° = , and
cot60° = =
cos60° =
cot60° cos60°
= ×
= ← rationalise the denominator by multiplying by
= ×
=