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3 years ago

The base of a triangle is x cm and its height is (x-7) Write down the expression of the triangle

Mathematics

2 answers:

Nata [24]3 years ago

4 0

Step-by-step explanation:

if you mean the area of the triangle then it is S = 1/2*x(x-7)

marishachu [46]3 years ago

4 0

Answer:

Step-by-step explanation:

b= x cm

h = (x - 7) cm

Area of triangle = $\frac{1}{2}*x*(x-7)\\\\$

$\frac{x*x-x*7}{2}\\\\=\frac{x^{2}-7x}{2}$ square cm

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Lucy wants to be exempt from her semester exam. In order for that to happen, she has to average an 85 over 3 test grades. Her fi

anastassius [24]

Answer:

<em>Grades to be scored in 3rd exam = 88</em>

Step-by-step explanation:

Given that average of 3 numbers is 85.

First two numbers are 81 and 86.

To find:

3rd number so that average is 85

Solution:

Let the third number = $x$

Formula for average is:

$Average = \dfrac{Sum\ of\ numbers}{Total\ count\ of\ numbers}$

Here, sum of numbers = $81+86+x =167+x$

Total count of numbers = 3

$85 = \dfrac{167+x}{3}\\\Rightarrow x=255-167\\\Rightarrow \bold{x=88}$

<em>Grades to be scored in 3rd exam = 88</em>

8 0

3 years ago

Someone help me on this

Advocard [28]

Answer:

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Step-by-step explanation:

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3 years ago

Write the equation of a line passing through (0, 6) and parallel to the line y = 3/2x-7

Shkiper50 [21]

Parallel = same slope
Use formula: y = mx + b
Plug in the values (solve for b)
y = 3/2x + b
6 = 3/2(0) + b, b = 6

Solution: y = 3/2x + 6

3 0

3 years ago

Write and solve a proportion to answer the question. 40 is what percent of 32?

Ulleksa [173]

Answer:

125 percent

Step-by-step explanation:

The proportion is

40 percent

------ = ----------

32 100

Using cross products

40*100 =32 * percent

Divide by 32

4000/32 = percent

125 = percent

8 0

3 years ago

The sides of two triangles are in the ratio of 1:2. If the lengths of the sides of the first triangle are 5cm,9cm and 11 cm what

Sergeu [11.5K]

The lengths of sides of second triangle are:

10cm, 18cm and 22cm

Step-by-step explanation:

Given

Ratios of sides of triangle=> 1:2

Given sides of a triangle:

5cm,9cm and 11 cm

The ratio 1:2 means that for each 1 cm in first triangle, there are 2 cms in seconds triangle. This simply means that the sides of the second triangle are double of the first triangle.

So,

The sides of the second triangle are:

$Side1: 5*2 = 10\\Side 2: 9*2 = 18\\Side3 = 11*2 = 22$

Hence,

The lengths of sides of second triangle are:

10cm, 18cm and 22cm

Keywords: Triangles, ratios

Learn more about ratios at:

#LearnwithBrainly

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3 years ago