MATHEMATICS HIGH SCHOOL

Solve for x.

x2 + 9x = 0

Answers

Answer 1
Answer: You can use sum-product but the easiest way is to isolate x like this: x^2 + 9x (-9x) = 0 (-9x) x^2 = -9x x^2 (/x) = -9x(/x) x=-9

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2. Determine which ordered pair in the form (a, b) is a solution of the given equation.7a – 5b = 28

(–3, –2)
(–2, –3)
(0, 4)
(4, 0)


3. Determine whether the ordered pairs in the form (x, y) are solutions of the given equation and select the correct answer.

Yes, both are solutions.
No, neither is a solution.
The first is a solution, but the second is not.
The first is not a solution, but the second is.

Answers

(4,0) is the correct answer
because
by putting the co ordinates in equation:
7a-5b=28
7(4)-5(0)=28
28-0=28
28=28
so it is the right answer

At 12 noon, thetemperature was
3°F. Then the
temperature fell
steadily and reached
-1°F at 2:00 PM.

Answers

Noon to 2:00 pm is 2 hours

3 degrees to -1 degree is a total of 4 degrees.

The temperature changed 4 degrees in 2 hours.

4/2 = 2

The temperature dropped 2 degrees per hour.

The two legs (shorter sides ) if a right angle triangle have lengths of 15 cm and 8 cm respectively. Determine the length of the largest third side (to the nearest cm).

Answers

By Pythagoras theorem,
h^2=a^2+o^2
Longest side is the same as the hypotenuse (h)
h^2=8^2+15^2
h^2=64+225
h^2=289
Square root both sides
h=17 cm

If two circles have the same diameter, do they have the same circumference?

Answers

Yes they will have the same circumference

What is 40.8 ÷ 6? Please explain how you got your answer​

Answers

Answer:

6.8

How many 6's can go into 40?

6 + 6 + 6 + 6 + 6 + 6 = 36

6 6's

Subtract the amount off

40.8-36=4.8

How many 6's can go into 4.8?

0.6 + 0.6 +0. 6 + 0.6 + 0.6 + 0.6 + 0.6 + 0.6 = 48

0.8 6's

4.8 = 4.8 = 0

6 6's + 0.8 6's = 6.8 6's

6.8 is the answer

If you have any questions you can ask

Step-by-step explanation:

Which three-dimensional figure has exactly three rectangular faces? rectangular prism

rectangular pyramid

triangular prism

triangular pyramid

Answers

A triangular prism is a three-dimensional figure that has exactly three rectangular faces. Hence the correct answer is C.

What is a three-dimensional figure?

A three-dimensional shape is one that has three dimensions width, length, and height.

They differ from two-dimensional shapes because they have thickness.

Learn more about triangular prism at:

brainly.com/question/16128664
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