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Masja [62]
3 years ago
15

3. Solve by graphing: y = 2x + 6 x + y = -3

Mathematics
1 answer:
SVEN [57.7K]3 years ago
8 0

Answer:

y=-8x-3

Step-by-step explanation:


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A student multiplies (4+5i) (3-2i) incorrectly and obtains 12-10i what is the students mistakes
Rufina [12.5K]

Answer:

1. In the multiplication of the imaginary parts, the student forgot to square of i. OR

2. The student has only multiplied the real parts and the imaginary parts.

Correct value =22+7i.

Step-by-step explanation:

The given expression is

(4+5i)(3-2i)

A student multiplies (4+5i) (3-2i) incorrectly and obtains 12-10i.

Student's mistake can be either 1 or second:

1. In the multiplication of the imaginary parts, the student forgot to square of i.

2. The student has only multiplied the real parts and the imaginary parts.

(4+5i)(3-2i)=4\times 3+5\times (-2)i=12-10i

Which is not correct. The correct steps are shown below.

Using distributive property, we get

4(3-2i)+5i(3-2i)

4(3)+4(-2i)+5i(3)+5i(-2i)

12-8i+15i-10i^2

12+7i-10(-1)       [\because i^2=-1]

12+7i+10

22+7i

Therefore, the correct value of (4+5i)(3-2i) is 22+7i.

4 0
3 years ago
The scale on a map is 1 cm for every 400 km. If Maine and Japan are 22 cm apart on the map, what is the distance between Maine a
Leviafan [203]
Essentially, you must multiply 22 by 400. You get 8800 km apart for your answer.

5 0
3 years ago
What is the equation of the line, in point-slope form, that passes through the points (-1, 7) and (-2, 3)?
myrzilka [38]

Answer:

Step-by-step explanation:

(3-7)/(-2+1)= -4/-1= 4

y - 7 = 4(x + 1)

y - 7 = 4x + 4

y = 4x + 11

4 0
3 years ago
On a map the distance between two towns is 7 inches. What is the actual distance if the scale is 1 inch to 25 miles?
zimovet [89]
Multiply 7 times 25.
The answer is 175 miles.
6 0
3 years ago
Read 2 more answers
In a multiple choice examination of 20 questions, four marks are given for each correct answers and one mark is deducted for eac
finlep [7]

Answer:

Total Mark = 5c - a

Step-by-step explanation:

Total Mark = 4c - (a - c) = 5c - a

Marks for correct questions = 4c

Marks deducted for incorrect questions = a - c

8 0
3 years ago
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