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erma4kov [3.2K]
3 years ago
12

15% of $9 is $____________

Mathematics
2 answers:
Sever21 [200]3 years ago
5 0

Answer:$1.35

Step-by-step explanation:

kherson [118]3 years ago
4 0

Answer:

$1.35

Step-by-step explanation:

9 x 0.15 = 1.35

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Write a quadratic equation with roots of 3/4 and -4
Vaselesa [24]

A quadratic equation given roots is solved by using the relation

{x}^{2}  - (sum \: of \: roots)x + product \: of \: roots

from the question,

sum of the root will be

\frac{3}{4}  + ( - 4) =  \frac{3}{4}  - 4

=   \frac{3 - 16}{4}

=  \frac{ - 13}{4}

and also, product of the roots will

be

\frac{3}{4}  \times ( - 4) =  - 3

now substituting the sum of roots and product of roots into the equation

{x}^{2}  - ( -  \frac{13}{4} )x - 3

=  {x}^{2}  +  \frac{13}{4} x - 3

as the quadratic equation for the root 3/4 and -4

4 0
3 years ago
What is the square footage of a ploygon that is 120 x 100?
viva [34]

Answer:

12000

Step-by-step explanation:

8 0
3 years ago
81 millimeters is how many fluid ounces
alexira [117]
81 millimeters = 0.00273894 Fluid Ounces

Hope  this helps you!

5 0
3 years ago
Caitlin works at a department store and earns $12.75 per hour. She has $42 removed from every paycheck for medical insurance. If
ziro4ka [17]
The answer to the first question is $633.75=12.75h-42
The answer to the second one is 48
5 0
3 years ago
A store sells black ink pens for $5 and red ink pens for $4. John wishes to buy 20 pens but doesn’t wish to spend more than $92.
Zina [86]

Answer:  4r + 5(20-r) \le 92

=======================================

Explanation:

r = number of red pens

4r = cost of buying r red pens

example: if r = 10, then 4r = 4*10 = 40 is the total cost of buying 10 red pens

If John buys r red pens, then he must buy 20-r black pens so that r and 20-r add to 20.

John buys 20-r black pens, and at $5 each, so it will cost 5(20-r) dollars for just the black pens alone.

In total, John spends 4r + 5(20-r) dollars for all the pens (red & black)

We want $92 be the most he spends. This is the ceiling or highest value possible.

Therefore,

4r + 5(20-r) \le 92

--------------------

Extra info:

If you want to solve for r, then

4r + 5(20-r) \le 92

4r + 5(20)+5(-r) \le 92 distribute

4r + 100 - 5r \le 92  

100 - r \le 92

100-r+r \le 92+r add r to both sides

100 \le 92+r

100-92 \le 92+r-92 subtract 92 from both sides

8 \le r

r \ge 8

So John must buy at least 8 red pens. The most he can buy is 20 red pens since he wants 20 pens total.

8 0
2 years ago
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