When a teacher gives a test with questions that fall into 3 levels of difficulty (easy, moderate, and hard) The scoring method that would best allow her to identify the students who need help is:
B. weight each question by its difficulty: 1 for easy, 2 for moderate, and 3 for hard.
6 different types of cross sections of a cone are possible.
Step-by-step explanation:
<h3>
<u>Given Question :-</u></h3>


Given expression is

<em>On rationalizing the denominator, we get </em>


<em>We know, </em>

<em>So, using this, we get </em>







Hence,

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<h2>More Identities to know :- </h2>
(a + b)² = a² + 2ab + b²
(a - b)² = a² - 2ab + b²
a² - b² = (a + b)(a - b)
(a + b)² = (a - b)² + 4ab
(a - b)² = (a + b)² - 4ab
(a + b)² + (a - b)² = 2(a² + b²)
(a + b)³ = a³ + b³ + 3ab(a + b)
(a - b)³ = a³ - b³ - 3ab(a - b)
Answer:
C. 7.15 cm
Step-by-step explanation:
step 1
Find the new length of the floor
Remember that

The new length is equal to the original length multiplied by 1.30
so

step 2
Find the length of the floor on the new scale drawing
we have that
The scale drawing is

That means
1 cm in the drawing represent 6 feet in the actual
Multiply the length of the floor in the actual by the scale drawing
so

Answer: c
Step-by-step explanation: