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VashaNatasha [74]
3 years ago
5

Please help me, I really need it.

Mathematics
2 answers:
AnnyKZ [126]3 years ago
8 0
Number one is A
Number two is D
geniusboy [140]3 years ago
7 0

Answer:

1  False

b. 4.6 and -1.1

Step-by-step explanation:

A negative answer for x is ok

A negative answer inside the square root is not ok.  A negative answer inside the square root means the answer is not real.  A negative answer just means that x is less than zero.

The quadratic formula is

-b ± sqrt(b^2 -4ac)

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

2a


2x^2 -10= 7x

Lets get the equation in proper form

2x^2 -7x-10 = 7-7x

2x^2 -7x-10 =0

a=2  b=-7 c=-10


7 ± sqrt((-7)^2 -4(2)(-10))

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

2(2)

7 ± sqrt((49 +80)

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

4

7 ± sqrt((129)

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

4

7 ±11.3579

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

4

7 +11.3579             7-11.3579

------------------ and   -------------

4                                  4

4.589  and  -1.089475

Rounding

4.6 and -1.1

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Select the correct answer from each drop-down menu.
Rufina [12.5K]

Incomplete question. The completed question reads;

The Northville School Board has proposed this budget for the upcoming school year:

20% for school staff’s salaries

50% for school maintenance and upkeep

10% to refurbish the gymnasium

5% to upgrade the computer lab hardware

10% for new instruments for the music department

5% for new sports equipment

After a brief discussion, the school board revised the budget as follows:

20% for school staff’s salaries

50% for school maintenance and upkeep

10% to refurbish the gymnasium

10% to upgrade the computer lab hardware

5% for new instruments for the music department

5% for new sports equipment

In this case, the opportunity cost for (refurbishing the gym, upgrading the computer lab, or getting new instruments.) was ( upgrading the new computer lab hardware, getting new equipment, or getting new instruments?

Answer:

<u>getting new instrument</u>

Explanation:

Note that the term opportunity cost refers to the value or the cost of not selecting/benefitting from the other alternative option.

Comparing both budgets, it is observable that the budget for computer lab hardware was increased by 5%; and that of musical instruments was reduced by 5% according to The Northville School Board order of preference (importance).

Thus, we can say that the board decided to forgo some of the amount spent on musical instruments, but decided to increase spending on computer hardware.

8 0
3 years ago
Which expression equals 6x − 5y + 2 − 8x + 3( y + 5)? A) 3x − 2y + 17 B) −3x + 2y + 17 C) −2x − 2y + 17 D) −2x − 2y − 17
inysia [295]

Answer:

<u>C) −2x − 2y + 17</u>

Step-by-step explanation (PEMDAS):

First, we do <u>3 (y + 5)</u> because of the parenthesis:

6x − 5y + 2 − 8x + 3y + 15

Since there are no exponents, multiplication ,or division, we will add and subtract. But we have to make sure we <u>combine like terms</u>. X with X's, Y with Y's and constants with constants. And ALWAYS go from left to right

6x − 5y + 2 − 8x + 3y + 15

<u>−2x</u> − 5y + 2 + 3y + 15

−2x <u>− 2y</u> + 2 + 15

<em>−2x − 2y</em><em> </em><em>+ </em><em><u>17</u></em><em>.</em>

8 0
4 years ago
MOLECULES A glass of water contains 0.25 liter of water. If 1 milliliter of water contains 3.3 x 10^22 water molecules, how many
ValentinkaMS [17]

Answer:

8.25*10^24

Step-by-step explanation:

1000*.25= 250 (this converts the .25 into milliliters)

250(3.3 * 10^22)

= 8.25*10^24

7 0
3 years ago
A circle has a circumference of 8 It has an arc of length 32/5
Pepsi [2]

(176/35)^c=288°

answer is 288°.

3 0
4 years ago
5. What is the value of y?<br><br> 38 degrees<br> 52 degrees<br> 45 degrees<br> 76 degrees
abruzzese [7]

52 +52 = 104

180 -104 = 76

76 / 2 =38

y = 38 degrees

7 0
3 years ago
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