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saveliy_v [14]
4 years ago
14

You evaluated an expression using X=6 and y=9. You correctly got an answer of 105. Which expression did you evaluate?

Mathematics
1 answer:
Amiraneli [1.4K]4 years ago
7 0

Answer:

D: 10x + 5y

Step-by-step explanation:

If we substituted the x and y values in all of these equations, these are the equations and sums we would get:

A: 18 + 54 = 72

B: 30 + 90 = 120

C: 36 + 81 = 117

D: 60 + 45 = 105

Because we now know all of the sums for these equations, we can rule out A, B, and C because they don't have the correct answer that we got when we evaluated the expression which was 105. The only possible option would be D.

(sorry if this is confusing)

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A man makes 20% profit by selling watch for 500. Find cp​
statuscvo [17]

Here,

Profit - 20%

Sp - 500

Cp - ?

Now, ( let, Cp be x )

Sp = Cp + P% of Cp

500 = x + 20/100*x

500 = (100x + 20x)/100

500*100 = 120x

50000 = 120x

x = 416.66

Cp = 416.66

I hope you understand...

7 0
3 years ago
Identify A, B, and C in the equation x - 3y + 4 = 0.
daser333 [38]

Option D:

A = 1, B = –3 and C = 4.

Solution:

Given equation is x – 3y + 4 =0.

General equation of a line format:

<em>Ax + By + C = 0</em>

<u>To identify A, B and C in the given equation:</u>

x – 3y + 4 =0 is a equation of a line which is in the form of Ax + By + C = 0.

That is,

The coefficient of x is A ⇒ A = 1

The coefficient of y is B ⇒ B = –3

The constant term is C ⇒ C = 4

A = 1, B = –3 and C = 4.

Hence Option D is the correct answer.

5 0
3 years ago
At the north campus of a performing arts​ school, ​20% of the students are music majors. At the south​ campus, 70​% of the stude
antoniya [11.8K]

Answer:

The north campus had 800 while the south campus had 200.

Step-by-step explanation:

The question stated that there are 1000 students in the merged campus. That's the sum of the number of students in the north and the south campus before the merger.

Let x denote the number of students in the north campus before the merger. The other (1000 -x) students would all belong to the south campus before the merger.

Before the merger, 20\% of the students of the north campus are of music majors. In terms of x, that's (20\%)\cdot x = 0.20\,x students.

On the other hand, 70\% of the students of the south campus are of music majors. That corresponds to (70\%)\cdot (1000 - x) = 0.70\cdot (1000 - x) = 700 - 0.70\, x students.

With a similar logic, the number of music students in the merged east campus will be 30\% \times 1000 = 300.

The question implies that the sum of students in the two campuses should be equal to the number of music students in the east campus. That is:

0.20\, x+ (700 - 0.70\, x) = 300.

Solve for x:

x = 800.

In other words, there are 800 students in the north campus and (1000 - 800) = 200 students in the south campus before the merger.

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