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3 years ago

15. Sense or Nonsense

Mathematics

1 answer:

ch4aika [34]3 years ago

3 0

Says shouldn’t Say 18 inches because that is 1 ft 6 inches

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25- 26 and that's it

NISA [10]

25 - 26 is -1. Hope it helped :)

3 0

3 years ago

Which of the points plotted below satisfy the equation in the box? Check all that apply.

coldgirl [10]

Im not 100% sure but, this is how I solved the problem. Just plug the coordinates into the equation. For example, (3,9) x=3 and y=9.
the equation is y=x*3 so 9=3*3 and 3*3=9 so that point is true. If you continue to do the same thing for all the point you should get F,C, and D

7 0

4 years ago

a surveyor measures the distance to the two landmarks as shown in the diagram what is the distance d. between the landmarks

Inessa [10]

<h3>The distance between two landmarks is 123 meters</h3>

Solution:

We have to find the distance between two landmarks

Use the law of cosines

The third side of a triangle can be found when we know two sides and the angle between them

$c^2 = a^2 + b^2 - 2ab\ cos c$

Here, angle between 90 meters and 130 meters is 65 degrees

From figure,

a = 90

b = 130

c = d

Therefore,

$d^2 = 90^2 + 130^2 - 2(90)(130)\ cos 65\\\\d^2 = 8100 + 16900 - 23400\ cos\ 65\\\\d^2 = 25000 - 23400 \times 0.4226\\\\d^2 = 25000 - 9889.267\\\\d^2 = 15110.73\\\\d = 122.92\\\\d \approx 123$

Thus, the distance between two landmarks is 123 meters

8 0

4 years ago

Solve using square root method

avanturin [10]

$\frac{1}{2}(x+5)^2 + 9 = -15$

$\frac{(x+5)^2+18}{2} = \frac{-30}{2}$

Cancel out the denominators.

(x+5)² + 18 = -30

(x+5)² = -30 - 18

(x+5)² = -48

The equation is impossible, we have a negative number.

There isn't a number that squared gives a negative number (the square is always positive).

√(x+5)² = +/- √-48

x+5 = +/- √-48

IMPOSSIBLE

You can write the result in imaginary numbers

x+5=+/- 4i√3

6 0

3 years ago

Hey did I do this the right way

crimeas [40]

Yes 2m x 2m does equal 4m^2 and im sure you know 5 x -5 =-25

5 0

3 years ago

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