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3 years ago

Can someone help me out with these few questions.

Mathematics

1 answer:

Salsk061 [2.6K]3 years ago

3 0

The answer to the first problem is (-3,7). The answer to the second problem is (-2,3).

Step-by-step explanation:

I got this answer, because x is -3 in the first question, so you make all of the x' s in the problem a -3. Then y is 7 so you would make all the y' s a 7. From there you would solve the problem, and you would get -27=-27 and 23=23.

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What is the value of the expression 8p4: 32, 1680,40,296,40,320

muminat

Answer:

1680

Step-by-step explanation:

nPr = n!/(n-r)!

Therefore;

8P4 = 8!/(8-4)!

we get;

= 8!/4!

= (8×7×6×5×4×3×2×1)/(4×3×2×1)

= 40,320/ 24

= 1680

8 0

3 years ago

Which value of x will satisfy the inequality x + 7 < 15?

Nadusha1986 [10]

A. cuz 7+7=4 ; everything else would be equal to or larger than 15.

8 0

3 years ago

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A disk cost $3 more than a tape. rolex bought five disks and two tapes. The total cost was $120. what was the price of a disk?

Daniel [21]

First, I would organize your information into equations. So, the first sentence would be:

d = 3 + t d = disk and t = tape

Second and third sentence would be the equation:

5 d + 2 t = $120

To find the price of the disk, you would follow these steps.

5 (3 + t) + 2 t = 120 substitute d, with the equation that has a total, for

(3 + 2), then solve for t

15 + 5 t + 2 t = 120 distribute

15 + 7 t = 120 add like terms

7 t = 105 subtract from both sides

t = 15 divide from both sides

Then you substitute 15 in the first equation.

d = 3 + t substitute

d = 3 + 15 add

d = 18

So, d = 18 and t = 15. To check this, you just need to substitute the right variables.

1) 18 = 3 + 15

18 = 18

2) 5 (18) + 2 (15) = 120

90 + 30 = 120

120 = 120

When checking, we can see that the correct answer is $18 for the price of the disk.

Answer: $18

8 0

4 years ago

Please help no one is helping me :/

Ket [755]

Your answer would be D. or B. I think but i know it's not A.

6 0

4 years ago

The amount of time it takes to finish a race might be a function of which of the following?

Anna11 [10]

The <u>correct answer</u> is:

C) The distance of the race.

Explanation:

If one variable is written as a function of another, this means there is a relationship between the two variables.

There will be a relationship between the time it takes to finish a race and the distance of the race. The longer the distance of a race is, the more time it will take to finish it. Therefore the time can be written as a function of the distance.

7 0

4 years ago

Read 2 more answers