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2 years ago

Which expression is equivalent to -2-7?

Mathematics

2 answers:

quester [9]2 years ago

3 0

Answer:7

Step-by-step explanation:

just because

Katarina [22]2 years ago

3 0

-9
Explaination
(-2)-7 = -9
-7+2 = -9

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Which is greater ratio than 2:7

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Answer:

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Step-by-step explanation:

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3 years ago

A school theater director is planning a voluntary trip to New York City for students. He sends a poll regarding interest

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Sixty-eight percent is likely an overestimate for the percentage of parents interested in the trip.

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2 years ago

What is the GCF of 35,42,38

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The greatest common factor (GCF) of 35, 38, and 42 is 1.

There are no common prime numbers, so the GCF is 1.

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2 years ago

NCn is __________ equal to 1. always sometimes never

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NCn is always equal to 1.

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3 years ago

Read 2 more answers

Prove that a triangle with the sides a - 1 cm to root under a

vivado [14]

Question is Incomplete, Complete question is given below.

Prove that a triangle with the sides (a − 1) cm, 2√a cm and (a + 1) cm is a right angled triangle.

Answer:

∆ABC is right angled triangle with right angle at B.

Step-by-step explanation:

Given : Triangle having sides (a - 1) cm, 2√a and (a + 1) cm.

We need to prove that triangle is the right angled triangle.

Let the triangle be denoted by Δ ABC with side as;

AB = (a - 1) cm

BC = (2√ a) cm

CA = (a + 1) cm

Hence,

${AB}^2 = (a -1)^2$

Now We know that

$(a- b)^2 = a^2+b^2 - 2ab$

So;

${AB}^2= a^2 + 1^2 -2\times a \times1$

${AB}^2 = a^2 + 1 -2a$

Now;

${BC}^2 = (2\sqrt{a})^2= 4a$

Also;

${CA}^2 = (a + 1)^2$

Now We know that

$(a+ b)^2 = a^2+b^2 + 2ab$

${CA}^2= a^2 + 1^2 +2\times a \times1$

${CA}^2 = a^2 + 1 +2a$

${CA}^2 = AB^2 + BC^2$

[By Pythagoras theorem]

$a^2 + 1 +2a = a^2 + 1 - 2a + 4a\\\\a^2 + 1 +2a= a^2 + 1 +2a$

Hence, ${CA}^2 = AB^2 + BC^2$

Now In right angled triangle the sum of square of two sides of triangle is equal to square of the third side.

This proves that ∆ABC is right angled triangle with right angle at B.

4 0

3 years ago