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2 years ago

DON'T FORGET TO SIMPLIFY PLSSS!!!!!!

Mathematics

1 answer:

Bad White [126]2 years ago

5 0

Answer:

16692162

Step-by-step explanation:

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What is the sum of the geometric series? Sigma-Summation Underscript n = 1 Overscript 4 EndScripts (negative 2) (negative 3) Sup

belka [17]

Answer:

Step-by-step explanation:

∑⁴ₙ₌₁ -144 (½)ⁿ⁻¹

This is a finite geometric series with n = 4, a₁ = -144, and r = ½.

S = a₁ (1 − rⁿ) / (1 − r)

S = -144 (1 − (½)⁴) / (1 − ½)

S = -270

If you wanted to find the infinite sum (n = ∞):

S = a₁ / (1 − r)

S = -144 / (1 − ½)

S = -288

Read more on Brainly.com - brainly.com/question/14504382#readmore

8 0

3 years ago

Read 2 more answers

Two trains leave stations 306 miles apart at the same time traveling toward each other one is traveling at 90 mph the other at 8

Sergeu [11.5K]

Answer:

They will meet in 1.8 hours.

Step-by-step explanation:

Given that, distance between trains = 306 miles

Let they take time $'t'$ to meet each other.

Speed of first train = 90 mph

Speed of second train = 80 mph

Let distance traveled by first train = $D_1$ miles

Formula for distance:

$Distance = Speed \times Time$

Distance traveled by first train, $D_1 = 90t$

Let distance traveled by first train = $D_2$ miles

Formula for distance:

$Distance = Speed \times Time$

Distance traveled by first train, $D_2 = 80t$

Total distance traveled is 306 miles.

i.e.

$D_1+D_2=306\\\Rightarrow 90t +80t=306\\\Rightarrow 170t=306\\\Rightarrow t =\dfrac{306}{170}\\\Rightarrow \bold{t=1.8\ hr}$

They will meet in 1.8 hours.

3 0

3 years ago

What is the rang for the equation y=2x-3

a_sh-v [17]

Answer:

The range for the equation is all real numbers.

Step-by-step explanation:

The range of an equation is the set of y-values that you can get by plugging in all possible x-values.

Another way to put it is, when you graph the equation, whatever y-values the line produces, is its range.

Graphing y=2x-3, you can see it is a graph with a positive slope that extends from negative infinity y-value to positive infinity x-value.

4 0

3 years ago

In which tables does y vary directly with x? Check all that apply

ratelena [41]

Answer:

first three

Step-by-step explanation:

go directly to the x- value ed2020

5 0

3 years ago

-3x-3y=3 ,y=-5x-17 solving systems by substitution

Law Incorporation [45]

Answer:

(-4, 3)

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Equality Properties

Algebra I

Solving systems of equations by substitution/elimination

Step-by-step explanation:

Step 1: Define Systems

-3x - 3y = 3

y = -5x - 17

Step 2: Solve for x

Substitution

Substitute in y: -3x - 3(-5x - 17) = 3
Distribute -3: -3x + 15x + 51 = 3
Combine like terms: 12x + 51 = 3
Isolate x term: 12x = -48
Isolate x: x = -4

Step 3: Solve for y

Define equation: y = -5x - 17
Substitute in x: y = -5(-4) - 17
Multiply: y = 20 - 17
Subtract: y = 3

8 0

3 years ago