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3 years ago

The ratio of pencils to erasers is 4:1 if there are 20 pencils how many erasers are there?

Mathematics

1 answer:

Levart [38]3 years ago

7 0

It is 5 because you have to multiply by 5 by 4 and get 20 when you multiply by 5×1 and get 5

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PLZ AMSWER FULLY! <br><br> ****NEED DONE ASAP****

julia-pushkina [17]

Answer:

1. Josh's father: f Josh: f/2 - 2

2. f + (f/2 - 2) ≥ 49

3. 3/2 f - 2 ≥ 49

3/2 f ≥ 51

3f ≥ 102

f ≥ 34

4. 34

6 0

3 years ago

I'm confused about how to find x.

NikAS [45]

Hi! so you would find x by adding the corners up to 180 degrees.

steps:
Add the corners
90+(2x+1)+(5x+5)
7x+96=180
then subtract 96 from 180
you’d get 7x = 84
then divide 7 on both sides and get x=12

7 0

3 years ago

What's the answer to this math picture please?

professor190 [17]

Answer:

m<BGC = 145°

Step-by-step explanation:

<AGC and <DGB are vertical angles. Vertical angles are congruent. Therefore:

m<AGC = m<DGB

$3x + 20 = 8x - 5$ (substitution)

Collect like terms

$3x - 8x = -20 - 5$

$-5x = -25$

Divide both sides by -5

x = 5

m<BGC = 180 - (m<AGC) (linear pair)

m<BGC = 180 - (3x + 20)

Plug in the value of x

m<BGC = 180 - (3(5) + 20) = 180 - 35

m<BGC = 145°

3 0

3 years ago

A fraction reduces to 36. If its denominator is 6x^5 what is its numerator?

trapecia [35]

Answer:

Your answer will be 6^3x^5

4 0

3 years ago

3x^2+x-5=0 to 2 decimal place<br> 3x^3+2x-4=0 to 2 decimal place

Schach [20]

Answer:

1. 3/5

2. 1.219841

3. 2 - f(2)/7

4. -1.9682

5. 1.502446

Step-by-step explanation:

If we call

then the second approximation to the root of the equation f(x)=0 would be

hence

Here we have

Let's start with

then

Since the first 6 decimals of and are equal, the desired approximation is 1.219841

If the line y = 4x − 1 is tangent to the curve y = f(x) when x = 2, then f'(2) = 4*2 - 1 = 7, so

Here

We want to find all the values x such that

or what is the same, the x such that

so, let f(x) be

and let's use Newton's method to find the roots of f(x).

Since

f is strictly increasing, and since

f(1) = e+3-9 = e - 6 < 0

and

f has only one root in [1,2]

By using Newton's iterations starting with

Since then

x=1.50244564 is the desired root.

The answers as a comma-separated list would be

1, 1.573899431, 1.503982961, 1.502446348, 1.50244564

The answer rounded to six decimal places would be

1.502446

8 0

3 years ago