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3 years ago

12

Explain how you could use a number line to solve 70-50

2 answers:

Temka [501]3 years ago

7 0

You can use a number line to to solve this problem by moving the places

yaroslaw [1]3 years ago

4 0

So you would make your number line from 0 to 100 and each step on the number line would be 10. So go to 70 and count the number of steps needed to get to 50. Then take that number (2) and multiply it by 10 because each step was 10. So the anwser is 20

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5. A soil sample has a ratio of nitrogen to calcium of 4:6. If

shusha [124]

I uploaded the answer to a file hosting. Here's link:

tinyurl.com/wpazsebu

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3 years ago

write an equation in standard form of the line that passes through the point (-2,7) and has a slope of -1

gavmur [86]

Step-by-step explanation:

First, sub in the ordered pair to find y int

(7) = -1(-2) + b

7 = 2 + b

b = 5

So the equation in y int form is

y = -1x + 5

This when convert to stardard form is

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3 years ago

Show that 5x^2 + 2x - 3 < 0 can be written in the form | x + 1/5 | < 4/5

Sliva [168]

Step-by-step explanation:

First let solve the inequality

$5 {x}^{2} + 2x - 3 < 0$

Factor by grouping

$5 {x}^{2} + 5x - 3x - 3 < 0$

$5x(x + 1) - 3(x + 1)$

So the factor are

$(5x - 3)(x + 1)$

So the factor are

$x = \frac{3}{5}$

and

$x = - 1$

Solutions to a quadratic can be represented by a absolute value equation because remeber quadratics

creates 2 roots and/or double roots.

The inequality

$|x - b| < c$

works as

b is the midpoint between 2 roots. And c is the

$|x + b| = c$

We know that the midpoint between both roots is-1/5.

so

$|x - ( - \frac{1}{5} )| < c$

$|x + \frac{1}{5} | < c$

Let use roots 3/5

$| \frac{3}{5} + \frac{1}{5} | = \frac{4}{5}$

-1 works as well.

$| - 1 + \frac{1}{5} | = | - \frac{4}{5} | = \frac{4}{5}$

So the absolute value equation is

$|x + \frac{1}{5} | < \frac{4}{5}$

8 0

3 years ago

Please help me please love you bestie

tankabanditka [31]

Answer:

you'll look back on this and say how easy this is you got it. but for today the bottom one is (3,0) the middle one is (2,3) and the top one is (4,4)

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3 years ago

The equation below shows the relationship between the temperature in degrees Celsius, C, and degrees Fahrenheit, F:

34kurt

it is the last option C=5/9(F-32)

5 0

3 years ago

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