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4 years ago

If ab means 2a + b , then what is 25 ?

Mathematics

2 answers:

rewona [7]4 years ago

5 0

To solve this problem you must apply the proccedure shown below:

If $(a)(b)=2a+b$ , you have that:

$(2)(5)=(2)(2)+5=9$

Because $a=2$ and $b=5$

Therefore, as you can see, the answer is: $9$

Soloha48 [4]4 years ago

5 0

<u> Answer</u>

<u>Explanation</u>

a*b ⇒ 2a + b

2*5 ⇒ ?

Comparing a*b and 2*5, we can say that;

a = 2 and

b = 5

So, substituting a with 2 and b with 5 in the equation 2a + b we have,

a*b ⇒ 2a + b

2*5 ⇒ 2(2) + 5

⇒ (2×2) + 5

⇒ 4 + 5

⇒ 9

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19 is what kind of number ?

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Your answer: (Option A.)

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3 years ago

Steven wants to equally share his pizza with his three sisters what fraction of the pizza does he in each sister receive

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4 years ago

What is the solution to the system of equations? Use any method. {3x+y=32x+y=7 {2x+y=7

LuckyWell [14K]

Answer:

x = 12 and y = 1

Explanation:

Given equations are:

(1) ------ 1 3 x − y = 3

(2)------ 2 x + y = 25

Multiply (1) by 3 to eliminate the fractional part,

(1) ------- x − 3 y = 9 ⇒ x = 9 + 3 y

-------- let this be equation (3)

Now substitute this value of

from (3) in equation (2),

(2) --------- 2 ( 9 + 3 y ) + y = 25 ⇒ 18 + 6 y + y = 25 ⇒ 7 y = 25 − 18 ⇒ y = 7 7

Therefore,

y = 1

Substituting this value of

in equation (3),

x = 9 + 3 × 1

x = 9 + 3

Therefore,

x = 12

So we have the values of

x and y as,

x = 12

and

y = 1

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│Hope this helped _____________________│

│~Derelis ____________________________ │

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6 0

4 years ago

Read 2 more answers

Find the height of the triangle

Marianna [84]

Answer:

The height is 12 cm

Step-by-step explanation:

Hi there!

We are given a triangle with the 3 sides marked as 15, 20, and 25 and we want to find the height of it (marked as x in the problem).

This problem can seem a bit difficult, but let's see if the triangle is a right triangle first off.

One way to figure out if it is a right triangle is to apply the converse of the Pythagorean theorem.

Let's label the sides, where a is the shortest side, b is the second shortest side, and c is the longest side:

a=15

b=20

c=25

Now square a and b, then add the result together. If it's the same as c squared, then the triangle is a right triangle

15²+20²=25²

225+400=625

625=625

So we can safely say that the triangle is a right triangle

This makes the problem way easier, as there are 2 ways to find the area of a right triangle:

The first way is to multiply the legs (the sides that make up the right angle) together, then divide the result by 2

The other way is to multiply the height and the hypotenuse (the side OPPOSITE to the right angle) together, and then divide the result by 2

First, we need to figure out which sides are the legs, and which side is the hypotenuse

By the triangle inequality theorem, the hypotenuse of a right triangle is the longest side, which means that the 25 cm side is the hypotenuse, and that leaves 15 cm and the 20 cm sides as the legs

So let's find the area of the triangle using the legs

A= $\frac{15*20}{2}$ = $\frac{300}{2}$ =150

So the area of the triangle is 150 cm²

However, as mentioned above, we can also find the area of the triangle by multiplying the hypotenuse by the base, then dividing the result by 2

Which means that the area is also:

A= $\frac{25x}{2}$ cm²

As these both equal the area of the triangle, we can set them equal to each other. This is possible via a property known as transitivity (if a=b and b=c, then a=c)

$\frac{25x}{2}=150$