2 years ago

Evaluate the expression if xequalsminus1 and yequals7. 5x over x-y

Mathematics

1 answer:

erica [24]2 years ago

3 0

The answer is 5 over 8.

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In ΔABC, if m ∠A = m∠C, m∠B = ß (where ß is an acute angle), and BC = x, which expression gives the length of b, the side opposi

chubhunter [2.5K]

Answer:

The length of b is $\sqrt{2x^2(1-cos\beta)}$ .

Step by step explanation:

Given information: In ΔABC, ∠A =∠C, ∠B = ß (where ß is an acute angle), and BC = x.

Since two angles are same therefore triangle ABC is an isosceles triangle and side AB and BC are congruent.

$AB=BC=x$

According to Law of cosine

$b^2=a^2+c^2-2ac\cos B$

$b^2=x^2+x^2-2(x)(x)\cos \beta$

$b^2=2x^2-2x^2\cos \beta$

$b^2=2x^2(1-\cos \beta)$

$\sqrt{2x^2(1-cos\beta)}$

Therefore the length of b is $\sqrt{2x^2(1-cos\beta)}$ .

6 0

2 years ago

210÷5 first u break it down and divide it step by step and it =42

Artyom0805 [142]

That is the correct answer

6 0

2 years ago

Xander spends most of his time with his 10 closest friends. He has known 4 of his 10 friends since kindergarten. If he is going

Liula [17]

Note that there's a strict order here -> 2 close friends, then 1 non-close friend.

So, picking in order:
probability of picking the first close friend: 4/10
probability of picking the second close friend: 3/9
probability of picking the first non-close friend: 6/8

So, we get 4/10 * 3/9 * 6/8 = 1/10.

7 0

2 years ago

Read 2 more answers

Lydia earned $9.75 per hour last summer. She worked 25 hours a week. About how much did she earn in 8 weeks.

Kay [80]

Lydia earned $1,950 in 8weeks

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2 years ago

True or false. The following are equivalent statements

Alik [6]

Answer:

im pretty sure its false