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3 years ago

Are the ratios 2:1 and 10:7 equivalent? help please

Mathematics

2 answers:

eimsori [14]3 years ago

7 0

Answer: no i dont think so

Step-by-step explanation: 2x5 is 10

1x5 = 5 which is not 7

gladu [14]3 years ago

4 0

Yes it is because 2 is a factor that goes in 10 and 1 fits in 7

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At noon, the temperature is 90 degrees Fahrenheit. For the next several hours,the temperature falls by an average of 4 degrees a

iVinArrow [24]

The answer is the first One
T= 4n + 90

3 0

3 years ago

Solve -3x=2x^2-4 using quadratic formula

frozen [14]

Answer:

$x=-2.35078, 0.850781$

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Algebra I

Standard Form: ax² + bx + c = 0
Quadratic Formula: $x=\frac{-b\pm\sqrt{b^2-4ac} }{2a}$

Step-by-step explanation:

Step 1: Define equation

-3x = 2x² - 4

Step 2: Rewrite into Standard Form

0 = 2x² + 3x - 4

Step 3: Define variables

a = 2

b = 3

c = -4

Step 4: Find x

Substitute: $x=\frac{-3\pm\sqrt{3^2-4(2)(-4)} }{2(2)}$
Evaluate: $x=\frac{-3\pm\sqrt{9-4(2)(-4)} }{2(2)}$
Multiply: $x=\frac{-3\pm\sqrt{9+32} }{4}$
Add: $x=\frac{-3\pm\sqrt{41} }{4}$
Evaluate: $x=\frac{-3\pm6.40312}{4}$
Evaluate: $x=-2.35078, 0.850781$

And we have our final answer!

6 0

3 years ago

What is the rule for finding the vertex of a formula in Standard form? Use that rule to

worty [1.4K]

The vertex is the minimum or the maximum point of the parabola.

x and f(x) represent the horizontal and the vertical coordinates of the vertex.

The standard form of a parabola is

$f(x) = ax^2 +bx + c$

The x coordinate of the parabola is calculated using:

$x =-\frac{b}{2a}$

The value of the x-coordinate is then plugged in, into the equation to calculate the y-coordinate, as follows:

$f(\frac{b}{2a}) = a(-\frac{b}{2a})^2 + b(-\frac{b}{2a}) + c$

At the end of the calculation,

x and f(x) represent the horizontal and the vertical coordinates of the vertex.

Take for instance:

$f(x) = 2x^2 + 4x - 9$

The x-coordinate of the vertex is:

$x = -\frac b{2a}$

$x = -\frac 4{2 \times 2}$

$x = -\frac 44$

$x=-1$

The y-coordinate is:

$f(x) = 2x^2 + 4x - 9$

$f(-1) =2 \times (-1)^2 + 4 \times -1 - 9$

$f(-1) =-11$

So, the vertex of $f(x) = 2x^2 + 4x - 9$ is (-1,11)

See attachment for illustration of vertex of $f(x) = 2x^2 + 4x - 9$

Read more about vertex of parabola at:

brainly.com/question/20209326

5 0

2 years ago

Need help, This is due very soon! <3

garik1379 [7]

Answer:

8 months

Step-by-step explanation:

You: $20 + 15.50 per month I Your friend: $88 + 7

First month: 35.50 I First month: 95.00

Second month: 51.00 I Second month: 102.00

Third month: 66.50 I Third month: 109.00

Fourth month: 82.00 I Fourth month: 116.00

Fifth month: 97.50 I Fifth month: 123.00

Sixth month: 113.00 I Sixth month: 130.00

Seventh month: 128.50 I Seventh month: 137.00

Eighth month: 114.00 I Eighth month: 114.00

5 0

3 years ago

Estimate the sum of 1/8 + 1/4

Alex17521 [72]

1/8+1/4=1/8+2/8=3/8
About 0.4 because 4•8=32~30

7 0

3 years ago

Read 2 more answers