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sergeinik [125]
2 years ago
13

Answer the following:4-(-3),-2-(-7),-9-(-4)

Mathematics
2 answers:
Elina [12.6K]2 years ago
4 0

the first one is 7

the second one is 5

the third one is -5

Romashka [77]2 years ago
3 0

Answer:

4 – (– 3) = 4 + 3 = 7

-2 – (– 7) = -2 + 7 = 5

-9 – (– 4) = -9 + 4 = -5

<u>-TheUnknownScientist</u><u> 72</u>

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2.
abruzzese [7]

Answer:

  a) 30 kangaroos in 2030

  b) decreasing 8% per year

  c) large t results in fractional kangaroos: P(100) ≈ 1/55 kangaroo

Step-by-step explanation:

We assume your equation is supposed to be ...

  P(t) = 76(0.92^t)

__

a) P(10) = 76(0.92^10) = 76(0.4344) = 30.01 ≈ 30

In the year 2030, the population of kangaroos in the province is modeled to be 30.

__

b) The population is decreasing. The base 0.92 of the exponent t is the cause. The population is changing by 0.92 -1 = -0.08 = -8% each year.

The population is decreasing by 8% each year.

__

c) The model loses its value once the population drops below 1/2 kangaroo. For large values of t, it predicts only fractional kangaroos, hence is not realistic.

  P(100) = 75(0.92^100) = 76(0.0002392)

  P(100) ≈ 0.0182, about 1/55th of a kangaroo

5 0
3 years ago
A lone segment has ______ endpoints.<br><br>1) three<br>2)two<br>3)zero<br>4)one​
Nikolay [14]

Answer:

<h2><em><u>2)</u></em><em><u> </u></em><em><u>two</u></em></h2>

Step-by-step explanation:

A line segment forms when it has two end points

8 0
2 years ago
Read 2 more answers
Here are the total scores of 10 students in an introductory statistics course.
cestrela7 [59]

Answer:

Kindly check explanation

Step-by-step explanation:

Given that :

Mean (m) = 72

Standard deviation (sd) = 10

Grading cutoff policy:

bottom 5% receive F

next 15% receive D

next 35% receive C

next 30% receive B

A) Give the cutoffs for the grades in this course in terms of standardized scores.

Standardized score for grade cutoff:

Locating the Zscore for the proportions on the z table :

Bottom 5% = 0.05 ; corresponding Zscore = - 1.645

next 15% receive D = (5 +15)% 0.20 ; corresponding Zscore = - 0.84

next 35% receive C = (20+35)% = 0.55 ; corresponding Zscore = 0.13

next 30% receive B = (55 + 30)% = 0.85 ; Corresponding Zscore = 1.04

B) Give the cutoffs in terms of actual total scores.

Recall:

Zscore = (x - m) /sd ; where x = actual score

x = sd*z + m

For F:

10*(-1.645) + 72 = 55.55

For D:

10*(-0.84) + 72 = 63.6

For C:

10*(0.13) + 72 = 73.3

For B:

10*(1.04) + 72 = 82.4

C) Do you think that this method of assigning grades is a good one?

Yes, it is good in terms of expressing scores around the mean such that score below are negative and those above are positive. However, it is a little bit ambiguous.

4 0
3 years ago
What is the exact volume of the cylinder?
enyata [817]

Answer:

Step-by-step explanation:

The formula for the volume of a cylinder is V = πr²h.  

Here, r = 5cm, and h = 15 cm, and so the volume is:

V = πr²h = π(5 cm)²(15 cm), or:

V = π(25 cm²)(15 cm) = 375π cm³, or approximately 1170 cm³

6 0
3 years ago
Write an equation for the hyperbola with vertices (-7,0) and (7,0), conjugate axis of length of 10?
lina2011 [118]
The hyperbola is more or less as in the picture below

notice the traverse axis is horizontal, meaning the positive fraction will be the one with the "x" variable in it, and notice the length of the "a" component

the conjugate axis is 10, notice the length of the  "b" component

thus    \bf \textit{hyperbola with horizontal traverse axis }\\\\&#10;\cfrac{(x-{{ h}})^2}{{{ a}}^2}-\cfrac{(y-{{ k}})^2}{{{ b}}^2}=1&#10;\qquad center\ ({{ h}},{{ k}})\qquad&#10; vertices\ ({{ h}}\pm a, {{ k}})

so, hmmmm plug in those values

6 0
3 years ago
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