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den301095 [7]
2 years ago
14

-4-7=? I dont really understand

Mathematics
1 answer:
Anit [1.1K]2 years ago
5 0

-4 + -7= -11

When adding  negative numbers if the are both negative then you add them. When you have a negative and a positive you subtract.  In this problem they just took out the plus sign.

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Given:• PQRS is a rectangle.• mZ1 = 50°Р21SRWhat is mZ2?130°85°70°65°
Over [174]

To answer this question, we need to recall that: "the diagonals of a rectangle bisect each other"

Thus, if we assign the point of intersection of the two diagonals in the rectangle as point O, we can say that the triangle OQR is an "isosceles triangle". Note that this is because the lengths OR and OQ are equal since we know that: "the diagonals of a rectangle bisect each other". See the below diagram for clarity.

Now, we have to recall that:

- the base angles of any isosceles triangle are equal. This is a fact, and this means that the angles

- also the sum of all the angles in any triangle is 180 degrees

Now, considering the isosceles triangle OQR, we have that:

\angle OQR+\angle ORQ+\angle ROQ=180^o

Now, since the figure already shows that angle m\angle2+\angle ORQ+50^o=180^oNow, since we have established that the base angles m\angle2+m\angle2+50^o=180^owe can now solve the above equation for m<2 as follows:

\begin{gathered} m\angle2+m\angle2+50^o=180^o \\ \Rightarrow2m\angle2+50^o=180^o \\ \Rightarrow2m\angle2=180^o-50^o \\ \Rightarrow2m\angle2=130^o \\ \Rightarrow m\angle2=\frac{130^o}{2}=65^o \end{gathered}

Therefore, the correct answer is: option D

7 0
1 year ago
An architect is making a model of a building she is designing. The kitchen will be 8 feet by 14 feet. The scale she is
tamaranim1 [39]

Answer:

12 inches by 21 inches

Step-by-step

Let's start with the 8 feet

for every 2 feet add three inches you get a total of 12 inches

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6 0
2 years ago
A viewfinder has a triangular lens. Some of the measurement of the length are shown below. Which of the following best represent
S_A_V [24]

Answer:

A

Step-by-step explanation:

First, we need to find the unknown angle of the triangle.

40 + 20 = 60

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So the unknown angle is 120.

Then, we can use the law of sines to create a proportion.

sin(120)/8 = sin(40)/a

Then, we can simplify this.

a is about 5.9, or answer choice A.

5 0
2 years ago
Divide 7/9 by -11/7 then simplify
gayaneshka [121]
Invert the divisor and then multiply 7/9 by your result:

 7      -7        -49
--- * ------ = ---------
 9      11          99
6 0
3 years ago
Parabolas, hyperbolas, ellipses, and circles are all types of __________.
r-ruslan [8.4K]
Parabolas, hyperbolas, eclipses, and circles are all types of C)Conic Sections
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3 years ago
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