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3 years ago

How do you do these math problems?

Mathematics

1 answer:

Crank3 years ago

3 0

D is the amount

n is the number of days

$D_{n=1} = 475\\D_{n=2} = 475 + (.75* 475)\\D_{n=3} = 475 + .75(475 + (.75 * 475))\\D_{n=3} = 475 + .75*475 + .75^{2} * 475\\D_{n} = 475 + .75*475+.75^{2}*475... +.75^{n-1} * 475$

So therefore:

$475 * \sum_{n=1}^{\infty} 0.75^{n-1} = D_{n}$

See attached images for a similar problem from Chegg

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I need help with this

GREYUIT [131]

Answer:

D. Rotation reflection is the right answer

3 0

4 years ago

Read 2 more answers

Find the slope of the line going through the points (0, -5) and (-2,1)

kvasek [131]

Answer:

$\displaystyle m=-3$

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Algebra I

Coordinates (x, y)
Slope Formula: $\displaystyle m=\frac{y_2-y_1}{x_2-x_1}$

Step-by-step explanation:

Step 1: Define

Point (0, -5)

Point (-2, 1)

Step 2: Find slope m

Simply plug in the 2 coordinates into the slope formula to find slope m

Substitute in points [Slope Formula]: $\displaystyle m=\frac{-5-1}{0--2}$
[Fraction - Denominator] Simplify: $\displaystyle m=\frac{-5-1}{0+2}$
[Fraction - Numerator] Subtract: $\displaystyle m=\frac{-6}{0+2}$
[Fraction - Denominator] Add: $\displaystyle m=\frac{-6}{2}$
[Fraction] Divide: $\displaystyle m=-3$

8 0

3 years ago

If 36 is 25% of the total, what is the total?

Alexandra [31]

Answer:144
Explanation: 25% of the total in other words means that it is 1/4 (a quarter). You could just multiply 36 by 4 to get the total (100%). If u want to verify, just multiply 144 by 0.25 and u should get 36.

7 0

3 years ago

the area of ava rectangular back yard is 325 square yards.if the length of the yards is 13 yards,what is the width of the yard

Viktor [21]

It is given in the question that, The area of ava rectangular back yard is 325 square yards and the length of the yards is 13 yards.

Let the width be w yard .

And area of rectangle is the product of length and width .

So we have

$325 = 13 w$