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Anna35 [415]
3 years ago
12

Which expression has a negative value?

Mathematics
2 answers:
Igoryamba3 years ago
3 0

Answer:

A: 7 + 3 (negative 4) (2)

Step-by-step explanation:

Just as a rule of thumb, whenever you multiply or divide one negative number and one positive number, the outcome is always negative. However, whenever you multiply or divide two negative numbers OR two positive numbers, the outcome is always positive.

Now, let's first convert all these words into simple mathematical expressions and then solve them:

A) "7 + 3 (negative 4) (2)" = 7 + 3 * (-4) * 2 = 7 + (-24) = -17

B) "Negative 2 Left-bracket 12 divided by (negative 3) Right-bracket" =

-2 * [12/(-3)] = -2 * (-4) = 8

C) "(15 minus 7) minus (9 divided by 3)" = (15 - 7) - (9/3) = 8 - 3 = 5

D) "Negative 5 Left-bracket 7 + (negative 14) Right-bracket minus 30" =

-5 * [7 + (-14)] - 30 = -5 * (-7) - 30 = 35 - 30 = 5

The only expression that produces a negative value is the first one, A.

Hope this helps!

vredina [299]3 years ago
3 0

Answer:

First one

Step-by-step explanation:

7 + 3 (negative 4) (2)

7 + 3(-4)(2)

7 - 24

= -17

Negative 2 Left-bracket 12 divided by (negative 3) Right-bracket

-2(12/-3)

-2 × -4

8

(15 minus 7) minus (9 divided by 3)

(15 - 7) - (9/3)

8 - 3

5

Negative 5 Left-bracket 7 + (negative 14) Right-bracket minus 30

-5(7 + -14) - 30

-5(-7) - 30

35 - 30

5

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A box witxh a height (x+5) cm has a square base with side x com. A second box with height (x+2) com has a square base with side
Eva8 [605]

Answer:

x=5.37 cm

Step-by-step explanation:

we know that

The volume of the box is

V=Bh

where

B is the area of the base of the box

h is the height of the box

<em>Box 1</em>

we have that

The area of the base is

B=x^2\ cm^2

h=(x+5)\ cm

The volume of the Box 1

is equal to

V_1=x^2(x+5)\ cm^3

V_1=(x^3+5x^2)\ cm^3

<em>Box 2</em>

we have that

The area of the base is

B=(x+1)^2\ cm^2

h=(x+2)\ cm

The volume of the Box 2

is equal to

V_2=[(x+1)^2(x+2)]\ cm^3

V_2=[(x^2+2x+1)(x+2)]\ cm^3

V_2=(x^3+2x^2+x+2x^2+4x+2)\ cm^3

V_2=(x^3+4x^2+5x+2)\ cm^3

Equate the equation of Volume 1 to the equation of Volume 2

(x^3+5x^2)=(x^3+4x^2+5x+2)

(5x^2)=(4x^2+5x+2)

5x^2-4x^2-5x-2=0

x^2-5x-2=0

Solve the quadratic equation by graphing

using a graphing tool

The solution is x=5.37 cm

see the attached figure

8 0
4 years ago
I would like help on this problem if anyone doesn't mind -(-4)+8
Snowcat [4.5K]
- (- 4) + 8 is the same as doing - 1(- 4) + 8 or - 1 x (- 4) + 8

Any negative times a negative becomes a positive so we just do 1 x 4 = 4. 

4 + 8 = 12. 

Your answer is 12. 
8 0
3 years ago
Read 2 more answers
3. The academic Quiz advisor needs to choose the top member to compete in a final challenge. Tobin and Yolanda have approximatel
Natali [406]

Answer:

The safer option, would be to pick Yolanda, because of the lower risk involved. It is certain that she would score in and around the mean.

But, if one is a betting man, the rewards from Tobin performing to the favourable side of his wider range of possible scores would guarantee a higher mark. Although, there's an equal likelihood that Tobin's scores might tilt towards the unfavourable side.

Step-by-step explanation:

The mean absolute deviation (MAD) and the inter quartile range (IQR) both serve to highlight the spread variables in the dataset about the mean.

The higher their respective values, the more the variation of the variables in the dataset. It means

A high MAD and IQR indicate that the possible different obtainable scores from the candidate can take on values from extreme lows to extreme highs all around the mean, a wider range of possible scores.

This translates to the fact that Tobin's scores, which have a clearly superior MAD and IQR, have a higher risk attached to them. It is possible the scores in the exam take on values much lower than the mean or values much higher than the mean.

Yolanda on the other hand, has a lower MAD and IQR, thereby indicating a narrower range of possible values for her scores. This means that her scores will hover in and around the mean without big variations.

Yolanda's scores have a lower risk attached to them as it is guaranteed thay she would score close to their common mean score.

But Tobin's scores have a high risk and high reward attached to them. Going with Tobin would mean that one is ready to expect a score from a wider range about the mean.

Tobin could spectacularly post scores that are very much more than their mean score or post scores that are way worse than their mean score.

So, the choice of who to pick depends on which approach one takes to this subject matter.

Minimum Highest loss would mean Yolanda is safer and a better option.

Maximim Highest gain would mean Tobin is worth the risk and might be a better option.

Hope this Helps!!!

5 0
3 years ago
SOME ONEEE PLZZ HELPP MEEEE
Dominik [7]

Answer:

2.5

Step-by-step explanation:

The minimum value is the minimum y-value a function includes. In this case, since you can see the function is periodic (it repeats itself <em>periodically</em>, hence periodic) and the smallest y-value the function encounters is 2.5 (doesn't go below this value), the minimum y-value is 2.5. I hope this made sense. If not, feel free to let me know.

6 0
3 years ago
Answer for this question
kirza4 [7]
The answer is no solution.
4 0
4 years ago
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