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Over [174]
3 years ago
10

Easy math question please help

Mathematics
2 answers:
vekshin13 years ago
7 0

Answer:

B. 5

Step-by-step explanation:

  • 2x-3=7
  • 2x=7+3
  • 2x=10
  • x=10/2
  • x=5

Option B

kondaur [170]3 years ago
5 0

Answer:

B

Step-by-step explanation:

2x-3=7

Add 3 to both sides:

2x=10

Divide both sides by 2:

x=5

Hope this helps!

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If a straight line y = mx + c passes through the intersecting point of 3x - y = 8 and x+ 2y = 5 which is perpendicular to the li
Sindrei [870]

Answer:

Point of intersection:

3x - y = 8 -  -  - (a) \\ x + 2y = 5 -  -  - (b)

2 × equation(b) + equation (a):

7x = 21 \\ x = 3 \\  \\ y = 3x - 8 \\ y = 1

Point of intersection = (3, 1)

Perpendicular line:

3x + 6y - 11 = 0 \\ 6y =  - 3x + 11 \\ y =  -  \frac{1}{2} x +  \frac{11}{6}

General equation of line:

y = mx + c \\ 1 = (2 \times 3) + c \\ c =  - 5

<u>Value</u><u> </u><u>of</u><u> </u><u>m</u><u>:</u>

<u>m \times m {}^{i}  =  - 1 \\ m \times  -  \frac{1}{2}  =  - 1 \\ m = 2</u>

8 0
3 years ago
Help me solve this problem please
chubhunter [2.5K]

10^2+8^2-7^2/(2*10*8)

= 115/160 = 0.71875 round off to 0.72

5 0
3 years ago
The add-ins are: 476, 832, 5769, 300, 892, the sun is?
agasfer [191]
I think you mean 'additives' and 'sum'
It's 8269 after you add it all together.
7 0
4 years ago
Read 2 more answers
Graph a triangle on the coordinate plane. Choose 1 transformation (reflection, rotation,
BlackZzzverrR [31]

Answer:

The answer in the procedure

Step-by-step explanation:

we have the right triangle ABC

The pre-image coordinates are

A(0,0),B(0,3),C(4,0)

The transformation to use is the translation

The rule of the translation is

(x,y)-----> (x+10,y)

That means----> The translation is 10 units to the right

The image coordinates are

Applying the rule of the translation

A'(0+10,0)=A'(10,0)

B'(0+10,3)=B'(10,3)

C'(4+10,0)=C'(14,0)  

using a graphing tool

see the attached figure

3 0
3 years ago
The perimeter of a triangle is 170 feet and the sides are in the ratio of 25:14:12. Find the area of the triangle.
Viktor [21]
Let
x,y, and z the long sides of the triangle 

we know that

x+y+z=170 ft------> equation 1
x/y=25/14----> y=14x/25------> equation 2
y/z=14/12-----> equation 3
x/z=25/12----> z=12x/25------> equation 4

substitute equation 2 and equation 4 in equation 1
x+[14x/25]+[12x/25]=170------> multiply by 25 both sides
25x+14x+12x=4250
51x=4250
x=4250/51
x=250/3
y=14x/25------> y=(250/3)*(14/25)----> y=140/3
z=12y/14-----> (140/3)*12/14----> z=40

Using Heron's formula,
Area of the triangle = √s (s-a) (s-b) (s-c)
where s is the semiperimeter
s=170/2-----> s=85 ft
Area=√85*[85-250/3]*[85-140/3]*[85-40]
Area=9.22*[1.67]*[38.33]*[45]------> Area=26558.21 ft²

the answer is
26558.21 ft²
6 0
4 years ago
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