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miv72 [106K]
3 years ago
5

By rounding to 1 significant figure, estimate 6.4 x 7.35

Mathematics
2 answers:
densk [106]3 years ago
5 0

Answer:

6.4 x 7.4 =47.36

Step-by-step explanation:

7.35 rounded will be 7.4

Jet001 [13]3 years ago
5 0
The answer is 47.6 I think
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Write the equation of the line that passes through (−3,1) and (2,−1) in slope-intercept form
Alex787 [66]

Answer:

y=-\frac{2}{5}x-\frac{1}{5}

Step-by-step explanation:

The equation of a line is y = mx + b

Where:

  • m is the slope
  • b is the y-intercept

First, let's find what m is, the slope of the line.

Let's call the first point you gave, (-3,1), point #1, so the x and y numbers given will be called x1 and y1.

Also, let's call the second point you gave, (2,-1), point #2, so the x and y numbers here will be called x2 and y2.

Now, just plug the numbers into the formula for m above, like this:

m = -\frac{2}{5}

So, we have the first piece to finding the equation of this line, and we can fill it into y=mx+b like this:

y=-\frac{2}{5}x + b

Now, what about b, the y-intercept?

To find b, think about what your (x,y) points mean:

  • (-3,1). When x of the line is -3, y of the line must be 1.
  • (2,-1). When x of the line is 2, y of the line must be -1.

Now, look at our line's equation so far: y=-\frac{2}{5}x + b. b is what we want, the --\frac{2}{5} is already set and x and y are just two 'free variables' sitting there. We can plug anything we want in for x and y here, but we want the equation for the line that specfically passes through the two points (-3,1) and (2,-1).

So, why not plug in for x and y from one of our (x,y) points that we know the line passes through? This will allow us to solve for b for the particular line that passes through the two points you gave!

You can use either (x,y) point you want. The answer will be the same:

  • (-3,1). y = mx + b or 1=-\frac{2}{5} * -3 + b, or solving for b: b = 1-(-\frac{2}{5})(-3).b = -\frac{1}{5}.
  • (2,-1). y = mx + b or -1=-\frac{2}{5} * 2 + b, or solving for b: b = 1-(-\frac{2}{5})(2). b = -\frac{1}{5}.

See! In both cases, we got the same value for b. And this completes our problem.

The equation of the line that passes through the points  (-3,1) and (2,-1) is y=-\frac{2}{5}x-\frac{1}{5}

8 0
3 years ago
Are the quadrilaterals similar? If so, give the scale factor. If not, explain.
castortr0y [4]
These are not similar.  For them to be similar, they need to exist in proportion to each other for every single side.  The ratio of the 12:9 sides is 4:3 when reduced.  The ratio of the other 2 sides is 5:3.  They all have to have the same ratio for them to be similar.
7 0
3 years ago
Surface area of this figure?
Lelechka [254]
Surface area is:
6*8=48
12*10=120
8*12=96
6*12=72

48+72+120+96 = 336
The surface area is 336 square km
7 0
3 years ago
A rectangular window has a length of 81.47 cm and a width of 34.2 cm. What is the least precise measurement of the perimeter of
Pie

The least precise measurement of the perimeter of the window is 231.30

Step-by-step explanation:

The least price measurement mean a value with the least number of significant figures.calculate the perimeter in this case as;

Perimeter of a rectangle = 2(l+w) where l is the length and w is the width

Perimeter= 2(81.47 + 34.2)

Perimeter=2(115.67)

Perimeter=231.34

Perimeter=231.30(4 significant figures)

Learn More

  • Significant figures : brainly.com/question/11566364

Keywords : Perimeter, Least precise measurement

#LearnwithBrainly

7 0
3 years ago
2. Barb buys 300 feet of wire, a crystal radio for $16.50, a flashlight for $7.95, and 2 batteries for $4.95 each. Her total bil
DedPeter [7]

Answer:

$ 0.08 cents per foot

Step-by-step explanation:

add all of the numbers then subtract by 58.35 and divide by 300 and remove the negative

4 0
3 years ago
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