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4 years ago

An elevator is on the 20th floor. it goes down 11 floors and then up 5 floors .what floor is the elevator on noW.

Mathematics

2 answers:

amm18124 years ago

4 0

Answer: 14th floor

Step-by-step explanation:

20 - 11 + 5 = 14

Tanya [424]4 years ago

3 0

Answer: 14

Step-by-step explanation:

20-11=9

9+5 = 14

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The sum of two consecutive integers is 31. Find the numbers.

Radda [10]

<span>X+(X+1)=31
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3 years ago

Find the sum of the first 18 odd positive integers.

faltersainse [42]

Answer:

The sum of the first 18 odd positive integers is 324.

Step-by-step explanation:

Given : The first 18 odd positive integers.

To find : The sum of the first 18 odd positive integers?

Solution :

The odd positive integers are 1,3,5,.... forming an Arithmetic sequence .

Where, First term is a=1

Common difference is d=2

Number of terms n=18

The sum of A.P formula is

$S_n=\frac{n}{2}[2a+(n-1)d]$

Substitute the values in the formula,

$S_{18}=\frac{18}{2}[2(1)+(18-1)2]$

$S_{18}=9[2+(17)2]$

$S_{18}=9[2+34]$

$S_{18}=9[36]$

$S_{18}=324$

Therefore, The sum of the first 18 odd positive integers is 324.

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4 years ago

Judy borrows $500 from her friend and promises to pay back in 2 years with the 3% of interest rate. Calculate the simple interes

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Step-by-step explanation:

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3 years ago

Distance between two points khan academy

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The steps to derive the quadratic formula are shown below:

prohojiy [21]

Answer:

$\huge\boxed{\sf Option \ B}$

Step-by-step explanation:

$\displaystyle x^2+\frac{bx}{a} =\frac{-c}{a}$ --------------------(1)

to find the b² for the expression on the left.

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$\displaystyle x^2 + \frac{bx}{a}$

<u>We can also write it as:</u>

$\displaystyle (x)^2 + 2(x)(\frac{b}{2a} )$

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So, we will add $\displaystyle \frac{b^2}{4a^2}$ to both sides in Eq. (1)

For STEP 4, the equation will become:

$\displaystyle x^2+\frac{bx}{a} + \frac{b^2}{4a^2} = \frac{-c}{a} + \frac{b^2}{4a^2}$

$\rule[225]{225}{2}$

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2 years ago

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