MATHEMATICS MIDDLE SCHOOL

X^2 +105x-1050=1550

please help

Answers

Answer 1
Answer:
-x^2+105x-1050=1550
We move all terms to the left:
-x^2+105x-1050-(1550)=0
We add all the numbers together, and all the variables
-1x^2+105x-2600=0
a = -1; b = 105; c = -2600;
Δ = b2-4ac
Δ = 1052-4·(-1)·(-2600)
Δ = 625
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
x1=−b−Δ√2ax2=−b+Δ√2a
Δ−−√=625−−−√=25x1=−b−Δ√2a=−(105)−252∗−1=−130−2=+65x2=−b+Δ√2a=−(105)+252∗−1=−80−2=+40
Answer 2
Answer: x equals 2588 over 105 which simplifies to 24.6 

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The sales tax for an item was $14.80 and it cost $370 before tax.Find the sales tax rate. Write your answer as a percentage.

Answers

Answer:

Step-by-step explanation: 370+14.80= 384.80

When you add them together the answer is 384.80

Use the discriminant to determine the number and type of solutions the equation has.x2 + 8x + 12 = 0
a. no real solution
b. one real solution
c. two rational solutions
d. two irrational solutions

Please help me :)

Answers

x^2 + 8x + 12 = 0\n \na=1 , b= 8, c= 12 \n \n \Delta =b^2-4ac = 8^2 -4\cdot1\cdot12= 64-48= 16\n \n\Delta > 0 \n \n Answer : \ C. \ \ two \ rational \ solutions
ax^2+bx+c=0\ \ \ \Rightarrow\ \ \ \Delta=b^2-4\cdot a\cdot c\n\n\Delta>0\ \ \ \Rightarrow\ \ \ two\ real\ solutions\n\Delta=0\ \ \ \Rightarrow\ \ \ one\ real\ solution\n\Delta<0\ \ \ \Rightarrow\ \ \ no\ solution\n---------------\nx^2+8x+12=0\ \ \ \ \Rightarrow\ \ \ \Delta=8^2-4\cdot 1\cdot12=64-48=16\n\n\Delta>0\ \ \ \ \Rightarrow\ \ \ two\ real\ solutions\ \ \ \Rightarrow\ \ \ Ans.\ C

What is 34-34

(A) 0

(B) 90

(C) 7

(D) 12

Answers

Answer:

0

Step-by-step explanation:

Answer/Step-by-step explanation:

34 - 34= 0

It basically undoes what is being done and gets rid of its worth.

Rachel rounded 13,458 to the nearest hundred. Then she rounded her answer to the nearest thousand

Answers

the anwser should be 1400

How many different combinations are there of the digits 46987?

Answers

Answer:

1,00000,00,00

Step-by-step explanation:

The digits 46987 can be arranged in 120 unique combinations using the permutation formula 5! (5 factorial), accounting for all possible orders of these digits.

While organizing the digits 46987, there are 120 unmistakable mixes conceivable. Still up in the air by ascertaining the factorial of the quantity of digits (5!), yielding 120. Every game plan brings about a remarkable mix. For instance, 46987, 78694, and 98746 are among the changed stages.

The idea of changes has expansive applications, going from arithmetic to software engineering, where request matters. In combinatorics, the investigation of counting and game plan, changes assume an essential part. These 120 mixes grandstand the adaptability of revamping only five digits.

Showing the dramatic development in potential outcomes as the quantity of digits increments. This numerical standard impacts fields like cryptography, where producing one of a kind successions is significant for security. Generally, the changes of 46987 outline the charming and strong parts of numerical control and request.

To learn more about Combinations, refer:

brainly.com/question/18820941

Samantha has $45 to spend on a new dress.Select all of the following options that Samantha can afford.


A $45 green dress with 10% tax.


A $40 red dress with 5% tax added to the total.


A black dress that is 20% off of the original price of $50.


A $36 blue dress bought online that requires an additional 15% shipping fee.

Answers

45 + ( 10 / 100 ) * 45 = 49.5 > 45 No
40 + ( 5 / 100 ) * 40 = 42 < 45 Yes
50 - ( 20 / 100 ) * 50 = 40 < 45 Yes
36 + ( 15 / 100 ) * 36 = 41.4 < 45 Yes
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