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DedPeter [7]
3 years ago
13

Triangle STU has reflected over line m to form Triangle S'T'U'. What is the value of y?

Mathematics
1 answer:
Lera25 [3.4K]3 years ago
3 0

Answer:

  D.  5

Step-by-step explanation:

The congruence of S'T' with ST tells you ...

  9 = x +7

  2 = x

The congruence of S'U' and SU tells you ...

  4x = y +3

  4·2 -3 = y = 5 . . . . substitute the value of x; subtract 3

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On a road map, the distance from Green mount to Yorktowne is 2 inches. The map scale is
inessss [21]

Answer:

D

Step-by-step explanation:

yt = 2

the ratio is 1:25

2×25=50

7 0
3 years ago
State whether the following statements are true or false, and explain your reasoning.
Masja [62]

Answer:

Step-by-step explanation:

a) A square is a rectangle.   True

Reason: Property of Rectangle: (i) Opposite sides are equal and parallel. (ii) Each angle is 90 (iii) Diagonals are equal and bisect each other.

A square hold all these properties. A square is  a rectangle.

b) A polygon with 21 sides has 432 possible diagonals. False

Reason: Number of diagonals of a polygon = \frac{n(n-3)}{2}

n --> number of sides of a polygon.

= \frac{21*18}{2} = 189 diagonals

c) All three angles in an Isosceles triangle are equal. False

Reason: In an isosceles triangle, two angles are equal.

If three angles are equal, then that is an equilateral triangle.

d) The measures of the exterior angles of a nonagon, a nine-sided figure, have a sum of 360°. True.

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6 0
3 years ago
Read 2 more answers
Need help. greatly appreciated
gizmo_the_mogwai [7]
1. It must be divisible by 2 and 3. It IS divisible by 2. it IS divisible by 3. No remainder.
2. Add the digits and see if the sum is divisible by 3. Apply this rule to both numbers. 3 is not a common factor.
3a. 639
3b. 1035
3c. 179

7 0
3 years ago
Of equations to answer the questions.
iren [92.7K]
2x + 3(8 - 3x) = 3
2x + 24 -9x = 3
-7x = -21
x = 3

y = 8 - 3x
y = 8 - 3(3)
y = 8-9
y = -1

Check the math:
2(3) + 3(-1) = 6 - 3 = 3
4 0
2 years ago
Please Please please
Nadusha1986 [10]

Answer:

is the name of your account from little mermaid?  :DDD

Step-by-step explanation:

Use SOH CAH TOA to recall how the trig functions fit on a triangle

SOH: Sin(Ф)= Opp / Hyp

CAH: Cos(Ф)= Adj / Hyp

TOA: Tan(Ф) = Opp / Adj

now just refer to the above ( also copy and paste the above on your computer some where so you have it always)

sin( D )= 28 / 53

sin( E ) = 45 / 53

cos(D) = 45 / 53

cos(E) = 28 / 53

4 0
3 years ago
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