MATHEMATICS MIDDLE SCHOOL

Which values of c will cause the quadriatic equation -x2+3x+c=0 to have no real number solutions

Answers

Answer 1
Answer:

Answer:

c > 9/4

Step-by-step explanation:

No real solutions;

B² - 4AC < 0

3² - 4(1)(C) < 0

9 - 4C < 0

4C > 9

C > 9/4

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ALGEBRA HELP PLEASE?!A group of art students are painting a mural on a wall. The rectangular wall has deminsions of (6x+7) by (8x + 5) and are planning on the mural to be (x+4) by (2x+5). What is the area of the remaining wall after the mural has been painted?
A: 46x^2 + 73x + 15
B: 48x^2 + 86x +35
C: 2x^2 + 13 + 20
D: 50x^2 + 99x + 55

Answers

i think A is the answer .

A scale for a scale drawing is 10cm:1mm. which is larger the actual object or drawing explain

Answers

If I'm understanding your question, the drawing is 10cm and for every 10cm, the drawing is etched 1mm. This means that no matter how big the drawing gets, the actual object will always be bigger since it's 10cm larger always than the drawing. Hope this helped!

Kori bought 56 boxes of tiles from the home improvement store, which was StartFraction 4 over 7 EndFraction of the total number of boxes that they had. How many boxes of tiles did the store have? 32 98 224 392

Answers

Answer:98

Step-by-step explanation: the total of boxes the store has is 98 boxes of tiles. This is computed by dividing 56 by 7 which is equal to 392. Then 392 will be divided by 4 which will give us 98

Answer:B.98

Step-by-step explanation:

A rectangular pool is 20 feet wide and 50 feet long. A deck used for sunning surrounds the pool. The deck is the same width all the way around the pool. The total area of the deck is 456 square feet. How wide is the walkway?A. 2 feet
B. 3 feet
C. 4 feet
D. 5 feet

Answers

Ahh, this question goes all the way back to my year 9 test a couple years ago; which I got wrong back then - I now know how

Firstly we find the expression for the area (using x as the walk way):
>50x * 2 (the left and right) 
>20x * 2 (the top and bottom)
>4 * x^2 (the corners)

Add them all together , Area = 140x + 4x^2
Now we place the deck's area, 456 into the expression

456 = 140x + 4x^2

Solve for x
I'm a bit rusty on this i'm afraid, but I believe the only way to solve this is to factorise it
0 = 4x^2 + 140x - 456
0 = 4(x+38)(x-3)            <
x must = -38 or = +3 (the numbers inside the brackets inverted)
x must = +3 as it's logical, you can't have a negative width

The walkway is 3 feet wide, we can put this into our expression to double check this,
456 = 140*(3) + 4(3)^2
456 = 420 + 4*9
456 = 420 + 36
456 = 456
Yes, 3 feet wide is correct.


*Note, I tried to keep this simple, please let me know if I didn't go into enough detail anywhere
The answer is b. 3 ft

What is 7.03+9.0+3.07 as menta math

Answers

7.03 + 9 + 3.07 = 7 + 3 + 9 + 0.03 + 0.07

= 10 + 9 + 0.1

= 19 + 0.1

= 19.1

Your answer is 19.1

Marci hiked 15 miles from Park Headquarters to Blue Lake in 5 hours. What was her average speed?

Answers

Answer:

3 miles per hour.

Step-by-step explanation:

15 divided by 5 is 3

each hour he would have covered 3 miles of distance.

Answer:

3 miles per hour

Step-by-step explanation:

The formula for average speed is: R = (D_(total) )/(T_(total) ) R being rate, D being distance, T being time. We substitute the values to get R = (15)/(5) Simplified 3. Her average speed was 3 miles per hour. Hope this helps!
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