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2 years ago

-3x + 4y = -8 -X 2y = -6

Mathematics

1 answer:

svetlana [45]2 years ago

7 0

Answer:

68.5. 3. 180. 68 o titltltl. 74 75 76 77. 12 73 1. 67.5. 67. 72 No Back. 66.5 ... 72 73 74 75 76 78 80. 1. 3 o lolo.1717% 17²1-²10. 20% 71 71/2 268. 12 13 zol. 80.5. 80. 79.5. 79. 78.5. 78. 10461+2+/21th 1+2 ot t 1+1. 70/2 71 71 72 73 74 75 ... 76. 1366 [1/t1 H H H H. 70% 71/2 72% 73% 74% 75. H. 77. I. 97-100.

Step-by-step explanation:

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6a - 5b when a = -3 and b = 4

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Given.

6a - 5b

Plug in values.

6(-3) - 5(4) =

-18 - 20 =

-38

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3 years ago

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zavuch27 [327]

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3 years ago

PLEASE SOVEL THIS I WILL GIVE OUT 20 POINT

Anettt [7]

9514 1404 393

Answer:

21.25 seconds

Step-by-step explanation:

In miles per second, the speed of the jet is ...

(720 mi/h)/(3600 s/h) = 1/5 mi/s

The speed of the sound is the same:

(1 mi)/(5 s) = 1/5 mi/s

Then the rate of closure between the airplane and the sound is ...

(1/5 mi/s) +(1/5 mi/s) = 2/5 mi/s

To find the time required to close a gap of 8 1/2 miles, we can use the relation ...

time = distance/speed

time = (8.5 mi)/(0.4 mi/s) = 21.25 s

The pilot will hear the thunder 21.25 seconds after the flash.

5 0

3 years ago

The dogs in an animal parade are grouped by size. There are 18 small dogs, 12 medium-sized dogs, and 10 large dogs. If one dog i

ruslelena [56]

Answer:

0.3

Step-by-step explanation:

Given:

Number of small dogs = 18

Number of medium-sized dogs = 12

Number of large dogs = 10

To find: probability that a medium-sized dog will be chosen

Solution:

Probability refers to chances of occurrence of some event.

Probability = number of favourable outcomes/total number of outcomes

Total number of dogs = 18 + 12 + 10 = 40

Number of medium-sized dogs = 12

So,

probability that a medium-sized dog will be chosen = Number of medium-sized dogs/Total number of dogs = $\frac{12}{40}=0.3$

3 0

3 years ago