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ruslelena [56]
3 years ago
5

write an equation to solve for x your only writing the equation. 7x+9 5×+3 there's three answers the bottom one is if none of th

e other two are right I thought the answer was number two but the person that answered it gave me a different number so somebody can help me I would mark this brainest did you see the third option is blank I came up with the answer number two is that correct or is it the 7x + 9 + 5x + 3 equals 180 brainest awared​

Mathematics
1 answer:
professor190 [17]3 years ago
3 0

Answer:

<h2>7x + 9 + 5x + 3 = 180</h2>

Step-by-step explanation:

its a supplementary angles:

so the equation is add the two equation equals to 180

7x + 9 + 5x + 3 = 180

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What value of x is in the solution set of 9(2x + 1) &lt; 9x - 18? <br> -4<br> -3<br> -2<br> -1
Anastaziya [24]

Answer:

The only possible answer that is correct is the first one, x = -4.

Step-by-step explanation:

Simplify the given inequality as much as possible, and then substitute each of the given x values one by one to determine which is in the solution set.

9(2x + 1) < 9x - 18 becomes 18x + 9 < 9x - 18, which, if reduced by dividing all four terms by 9, becomes 2x + 1 < x - 2.

Simplifying further, we get x < - 3.  The only possible answer that is correct is the first one, x = -4.  -4 < -3 is true.

8 0
2 years ago
Read 2 more answers
( -4 ) 3÷( -4 ) -12 ​
bazaltina [42]

Answer:

(-4)3/(-4)-12

-12/48

-1/4

Step-by-step explanation:

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8 0
3 years ago
You are picking up a friend and going to a concert. your friend lives 3 miles west of your house and the concert is 21 miles eas
artcher [175]
24 miles away from your house
3 0
3 years ago
Which statements are true about these lines? Select three<br> options.
gayaneshka [121]

i need the ancwer options and the linea

6 0
3 years ago
a regular rectangular pyramid has a base and lateral faces that are congruent equilateral triangles. it has a lateral surface ar
Margarita [4]
A pyramid is regular if its base is a regular polygon, that is a polygon with equal sides and angle measures.
(and the lateral edges of the pyramid are also equal to each other)

Thus a regular rectangular pyramid is a regular pyramid with a square base, of side length say x.

The lateral faces are equilateral triangles of side length x.

The lateral surface area is 72 cm^2, thus the area of one face is 72/4=36/2=18  cm^2.

now we need to find x. Consider the picture attached, showing one lateral face of the pyramid.

by the Pythagorean theorem: 

h= \sqrt{ x^{2} - (x/2)^{2}}= \sqrt{ x^{2}- x^{2}/4}= \sqrt{3x^2/4}= \frac{ \sqrt{3} }{2}x

thus, 

Area_{triangle}= \frac{1}{2}\cdot base \cdot height\\\\18= \frac{1}{2}\cdot x \cdot \frac{ \sqrt{3} }{2}x\\\\ \frac{18 \cdot 4}{ \sqrt{3}}=x^2

thus:

x^2 =\frac{18 \cdot 4}{ \sqrt{3}}= \frac{18 \cdot 4 \cdot\  \sqrt{3} }{3}=24 \sqrt{3}       (cm^2)

but x^{2} is exactly the base area, since the base is a square of sidelength = x cm.


So, the total surface area = base area + lateral area =  24 \sqrt{3}+72   cm^2


Answer: 24 \sqrt{3}+72   cm^2

4 0
3 years ago
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