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dlinn [17]
3 years ago
15

-6r+7r=5 ????????????

Mathematics
2 answers:
gtnhenbr [62]3 years ago
8 0

Answer:

r= 5

Step-by-step explanation:

telo118 [61]3 years ago
8 0
(-6+7)r=5

1r=5

Final: r=5
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ANSWER AND SHOW WORK FOR 40 POINTS
Elanso [62]

Answer:

Q1) (x+7)² = 9

x = -10, -4

Q2) (x-8)² = 144

x = -4, 20

Q3) (x-1)² = 81

x = -8, 10

Step-by-step explanation:

Q1) x² + 14x + 49 = 9

x² + 2(x)(7) + 7² = 9

(x + 7)² = 9

x + 7 = +/- sqrt(9)

x + 7 = 3

x = -4

x + 7 = -3

x = -10

Q2) x² - 16x + 64 = 144

x² - 2(x)(8) + 8² = 144

(x - 8)² = 144

x - 8 = +/- sqrt(144)

x - 8 = 12

x = 20

x - 8 = -12

x = -4

Q3) x² - 2x + 1 = 81

x² - 2(x)(1) + 1² = 81

(x - 1)² = 81

x - 1 =+/- sqrt(81)

x - 1 = 9

x = 10

x - 1 = -9

x = -8

5 0
3 years ago
Read 2 more answers
Add the following quantities, 76.2 pm + 0.123fm​
blondinia [14]

Answer:

m(  

1000

123f

​  

+  

5

381p

​  

)

Step-by-step explanation:

i dont know if thats right that my compution

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5 0
3 years ago
Can someone help with the last 2?
leonid [27]

Answer:

x > 6 and x ≤ 10

Step-by-step explanation:

You have to sleep for more than 6 hours, which means it is greater than and can not be equal to because it has to be more than 6 hours.

For the second problem, at most includes the 10th person so x is less than or equal to 10.

Hope this makes sense!!

6 0
3 years ago
Read 2 more answers
Find the probability that a student is not playing a sport or not taking a foreign
Gelneren [198K]

Answer:

18/25

Step-by-step explanation:

Total number of students = 23+14+10+3 = 50.

14 out of 50 are playing sport and taking a foreign language.

So the answer is (50 - 14) / 50

= 36/50

= 18/25.

3 0
3 years ago
Read 2 more answers
Letry. 14 Chapter 9: Chapter 9 rest Chapter Test
BaLLatris [955]

Answer:

h = 7.1 cm

Step-by-step explanation:

To find the height of the triangle, we can first find the area of the triangle using the Heron's formula:

S = \sqrt{p(p-a)(p-b)(p-c)}

Where a, b and c are the sides of the triangle and p is the semi perimeter of the triangle:

p = \frac{a+b+c}{2} = \frac{15 + 8 + 17 }{2} = 20\ cm

So the area of the triangle is:

S = \sqrt{20(20-15)(20-8)(20-17)}

S = 60\ cm^2

Now, to find the height, we can use the following equation for the area of the triangle:

S = base * height/2

The height draw in the figure is relative to the side of 17 cm, so this side is the value of base used in the formula. So we have that:

60 = 17 * h/2

h = 120/17

h = 7.06\ cm

Rounding to the nearest tenth, we have h = 7.1 cm

4 0
3 years ago
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