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olga_2 [115]
3 years ago
11

What number + (−56)=12 How do I do this?

Mathematics
2 answers:
Mars2501 [29]3 years ago
7 0

Answer:

Step-by-step explanation:

x+(-56)=12

exclude "x"

x=56+12

x=68

lyudmila [28]3 years ago
7 0

Answer:

Missing number = 68

Step-by-step explanation:

You can simply set up an equation like so: x+(-56)=12.

Then, proceed to solve by isolating the x by itself.

x+(-56)=12

   +56   +56  <--- Do the opposite operation on both sides to cancel the 56.

x=68

A quick pointer: A number plus a negative number is just subtracting so you can just work backwards.

Answer: 68.

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Find the value of b. Round <br> the nearest tenth.
maria [59]

Answer:

b= sin(43°) * 8 / sin(55°) ≈ 6.7

Step-by-step explanation:

Regarding the law of sines, each angle corresponds to the side opposite of it. Here, that means that the 82 degree angle is opposite of side c (so they correspond) and that the 55 degree angle corresponds to the side with 8cm. However, we are trying to find the length of side b. Therefore, assuming that the side with 8cm is side A, if we know that

sin A / a = sinB/b = sin C / C

= sin(55°)/8 = sinB/b = sin(82°) / c, we can take c out of the equation to get

sin(55°)/8 = sinB/b

If we know sinB, we can multiply both sides by 8 to remove a denominator to get

sin(55°) * b / 8 = sinB

multiply both sides by 8 to remove the other denominator to get

sin(55°) * b = sinB * 8

divide both sides by sin(55°) to isolate the b

b = sinB * 8/sin(55°).

Therefore, if we know sinB, we can figure out the length of b.

Because the angles of a triangle add up to 180 degrees, we can say that

180 = 82 + 55 + angle B

180 = 137 + B

subtract both sides by 137 to isolate B

43 = B

b= sin(43°) * 8 / sin(55°) ≈ 6.7

3 0
3 years ago
Help do y’all know this! Please if u do i need the answer
vekshin1

9.4 × 10^{2}

1) Move the decimal point 2 times to left in the number so that number, 940 so it's between 1-10: 9.4 or 9.40

2) After we moved our decimal point to the left, the decimal count would be 12 and that we moved 2 places to the left

3) We know that the notation is a x 10^{b}

a=9.4 and 6=2

9.4 × 10^{2}=a x 10^{b}

I hope I've helped!

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