Answer:
D. 2 = 2
General Formulas and Concepts:
<u>Pre-Algebra</u>
Order of Operations: BPEMDAS
- Brackets
- Parenthesis
- Exponents
- Multiplication
- Division
- Addition
- Subtraction
Step-by-step explanation:
<u>Step 1: Define</u>
x³ + 3x² = x + 3
x = -1
<u>Step 2: Check</u>
- Substitute in <em>x</em>: (-1)³ + 3(-1)² = -1 + 3
- Evaluate exponents: -1 + 3(1) = -1 + 3
- Multiply: -1 + 3 = -1 + 3
- Add: 2 = 2
Answer:
x = 35.5
Step-by-step explanation:
cos 65° = 15/x
cos 65° · x = 15
x = 15/cos 65°
x = 35.5
The answer is x = 6, because 2 divided by 12 is 6 if you simplify the answer you get 6
When Paolo tried to simplify 5 - 7 at Step 2, instead of keeping the sign of the answer, -2, he added it. He really should have written 3 - 2.
Answer:
The standard deviation of the sample mean differences is _5.23_
Step-by-step explanation:
We have a sample of a population A and a sample of a population B.
For the sample of population A, the standard deviation 
is
The sample size 
is:
.
For the sample of population B, the standard deviation 
is
The sample size 
is:
.
Then the standard deviation for the difference of means has the following form:
Finally
