$10x^2 - 31x-14=10x^2+4x-35x-14=2x(5x+2)-7(5x+2)=\\\\=(5x+2)(2x-7)\\\\D:\ \ 5x+2>0\ \ \ and\ \ \ \ \ 2x-7>0\\.\ \ \ \ \ \ 5x>-2\ \ \ \ \ \ and\ \ \ \ \ 2x>7\\.\ \ \ \ \ \ \ x>-\frac{2}{5}\ \ \ \ \ \ and\ \ \ \ \ \ x>3 \frac{1}{2} \\\\D=(3 \frac{1}{2};\ +\infty)\\\\Ans.\ \ The\ width\ is\ \ \ \ 2x-7$

7 0

3 years ago

John purchased a carr in 1961 for $12,000. Experts estimate that its value will increase by 5% per year. How much will be the co

dexar [7]

Answer:

Step-by-step explanation:

I'm super lazy rn and it doesn't need explanation

5 0

3 years ago

The credit remaining on a phone card (in dollars) is a linear function of the total calling time made with the card (in minutes)

SCORPION-xisa [38]

Answer:

The credit remaining on a phone card (in dollars) is a linear function of the

total calling time made with the card (in minutes), as shown in the figure below.

The remaining credit after 45 minutes of calls is $22.80 , and the remaining

credit after 64 minutes of calls is $19.76.

Step-by-step explanation:

What is the remaining credit after 73 minutes of calls?

;

Not sure what figure you are referring to, write an equation from the given values:

Assign the values as follows

x1 = 45; y1 = 22.80

x2 = 64; y2 = 19.76

Find the slope (m) using the formula: m = %28y2-y1%29%2F%28x2-x1%29

m = %2819.76-22.80%29%2F%2864-45%29 = %28-3.04%29%2F%2819%29

m = -.16

7 0

3 years ago