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shepuryov [24]
3 years ago
11

When x is decreased by 129 and then that number is multiplied by 129, the result is 129. What is the value of x?

Mathematics
1 answer:
myrzilka [38]3 years ago
4 0

Answer:

Step-by-step explanation:

twice the difference of a number and 3 is added to 4

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I really need help please:)
N76 [4]

Answer: the 3rd one or the 1rst one

Step-by-step explanation:

4 0
3 years ago
Prove that a parallelogram is a square iff its diagonals are both congruent and perpendicular
Juliette [100K]
Consider the parallelogram shown below.
The lengths of the sides are a and b.
The lengths of the diagonals are 2x and 2y.

Because the diagonals are both congruent and perpendicular, therefore there are two right triangles as shown.
Note that x = y.
Because x = y, each right triangle is isosceles and has the angles 90°, 45° and 45°.

From the Pythagorean theorem,
For one right triangle,
a² = x² + y² = x² + x² = 2x².
For the other right triangle,
b² = y² + x² = x² + x² = 2x²

Therefore
a² = b²
a = b

It follows that all sides of the parallelogram are equal and each angle is
45+45 = 90°

Therefore the parallelogram is a square.

6 0
4 years ago
Simplify the given expression. Assume x doesn’t = 0. (20x^-3/10x^-1)^-2
Zina [86]

Answer:

X^4 over 4

Step-by-step explanation:

5 0
3 years ago
Natalie and Maria left the school at 3:05 pm.They walked for 14 minutes before arriving at Maria's house. What time did they arr
Mila [183]

Answer:

They arrived at her house at 3:19

4 0
3 years ago
Read 2 more answers
A motorboat can maintain a constant speed of 44 miles per hour relative to the water. The boat makes a trip upstream to a certai
serg [7]

Answer:

Step-by-step explanation:

Distance upstream = (34-c)(39/60) miles

--------------------------

Distance downstream = (34+c)(29/60) miles

-----------------------------------------------

Equation:

distance = rate*time

distance up = distance down

(34-c)(39/60) = (34+c)(29/60)

Multiply both sides by 60 to get:

39(34-c) = 29(34+c)

39*34 - 39c = 29*34 + 29c

68c = 340

c = 5 mph speed of the current

4 0
3 years ago
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