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3 years ago

How old is the earth

Mathematics

1 answer:

lyudmila [28]3 years ago

3 0

Answer:

4.543 billion years

Step-by-step explanation:

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The sum of the measures of ∠QRT and ∠TRS is 180∘. What is the measure of ∠TRS If ∠TRS = ∠QRT?

Bad White [126]

Let the angles be x

∠QRT = x
∠TRS = x

We are taking both angles as x because they are equal!

$\mathcal{∠QRT + ∠TRS = 180 \degree}$

$\tt \: x + x = 180 \degree$

$\tt \: 2x = 180 \degree$

$\tt \: x = 90 \degree$

➪ Thus, The measure of both angles is 90°...~

5 0

2 years ago

Please Help please please

nlexa [21]

Answer:

5.25

Step-by-step explanation:

Take the distance between the two points and divide by 2.

The distance between the two is 10.5 (9.1-(-1.4))

Divide by two to find the midpoint.

6 0

3 years ago

Read 2 more answers

Solve for the value of R. SOMEONE PLEASE HELP ILL GIVE YOU POINTS AND BRAINLIST ANSWER !!!

lord [1]

Step-by-step explanation:

$(3r + 4) + (8r - 2) = 90$

$3r + 4 + 8r - 2= 90$

$11r = 88$

$r = \frac{88}{11} \\$

$r = 8$

7 0

2 years ago

Consider the matrix shown below:

velikii [3]

Answer:

$A)\ \ \ \ \left[\begin{array}{ccc}8&-5\\-3&2\\\end{array}\right]$

Step-by-step explanation:

Given the matrix: $\left[\begin{array}{ccc}2&5\\3&8\\\end{array}\right]$ , it's inverse is calculated using the formula:

$\left[\begin{array}{ccc}a&b\\c&d\\\end{array}\right]^{-1}=\frac{1}{det\left[\begin{array}{ccc}a&b\\c&d\\\end{array}\right] }\left[\begin{array}{ccc}d&-b\\-c&a\\\end{array}\right]$

#Therefore, we calculate as;

$\frac{1}{det\left[\begin{array}{ccc}2&5\\3&8\\\end{array}\right] }\left[\begin{array}{ccc}8&-5\\-3&2\\\end{array}\right] \\\\\\\\\#det\left[\begin{array}{ccc}2&5\\3&8\\\end{array}\right] =1\\\\\\\\=\frac{1}{1}\left[\begin{array}{ccc}8&-5\\-3&2\\\end{array}\right] \\\\\\\\=\left[\begin{array}{ccc}8&-5\\-3&2\\\end{array}\right]$

Hence, the inverse of the matrix is $\left[\begin{array}{ccc}8&-5\\-3&2\\\end{array}\right]$

8 0

3 years ago

What is the relationship between 21 and 22?

blsea [12.9K]

someone please help her or him please

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3 years ago

How old is the earth​

How old is the earth