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Lubov Fominskaja [6]
3 years ago
9

What is the value of k in the equation below

Mathematics
1 answer:
Dima020 [189]3 years ago
5 0

Answer:

<h2>4</h2>

Step-by-step explanation:

5k-2k=12

3k=12

k=4

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X2 - 2xy + y2 when x = 3 and y = 2​
luda_lava [24]

Answer:

1

Step-by-step explanation:

Substitute 3 for x and 2 for y:

3^2 - 2(3)(2) + 2^2

= 9 - 12 + 4

= 1

8 0
3 years ago
Read 2 more answers
A train travels from station A to station B. If the train leaves station A and makes 75 km/hr, it arrives at station B 48 minute
SSSSS [86.1K]

Answer:

  • A) 290 km
  • B) 4 hours
  • C) 72.5 km/h

Step-by-step explanation:

Let distance be d and time t

<u>At 75 km/h speed the distance is</u>

  • d = 75(t - 48 min) = 75(t - 48/60 hours)

<u>At 50 km/h speed the distance</u> is

  • d = 50t + 40

<u>Since the distance is same, we get the equation:</u>

  • 75(t - 48/60) = 50t + 40
  • 75t - 75*4/5 = 50t + 40
  • 75t - 60 = 50t + 40
  • 75t - 50t = 40 + 60
  • 25t = 100
  • t = 4 hours

<u>A) The distance between A and B</u>

  • d = 50*5 + 40 = 290 km

<u>B) Time is </u>

  • 4 hours as found above

<u>C) The speed = d/t</u>

  • Speed = 290/4 = 72.5 km/h

6 0
3 years ago
Charlotte needs to collect at least 5,000 signatures for her petition. She has already collected 3,187 signatures. Write and sol
Feliz [49]

Okay!

The most important part of this problem is knowing which inequality sign to use

Greater than >

Less Than  <

Equal to .. =

Greater or equal to ≥

Less than or equal to  ≤

Charlotte needs AT LEAST 5,000 votes, meaning she has to have 5,000 votes <u>or more </u>

That means we use this sign →  ≤

Now lets set up an equation to find how many more we need

5,000  ≤  3,187 + X

solve for X

1,813 ≤ X

Hope I helped :) Sorry for the long explanation

5 0
3 years ago
Find the exact value of cos (1140)°.
slamgirl [31]

now let's recall that a full circle has 360°, so then 1140 = 360 + 360 + 360 + 60.

namely, 1140 is 3 full-go-around the circle and then it lands on the I Quadrant at 60°.  Thus cos(1140°) = cos(60°).

what's that cosine of 60°?  Check the picture below.

8 0
3 years ago
Given f(x)= 17- x2, what is the average rate of change in f(x) over the interval [1, 5)?
makvit [3.9K]
-6 because it is yeah so
7 0
3 years ago
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