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3 years ago

What is the length of BC

Mathematics

1 answer:

Jobisdone [24]3 years ago

8 0

Answer:

Step-by-step explanation:

this is an isosceles triangle so AB = AC

2x-8 = x + 9

x -8 = 9

x = 17

so CB = 17

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Find the missing number in the factor tree<br><br> for 20 points<br><br> i hope you will help

ELEN [110]

Answer:

see below

Step-by-step explanation:

80 = 4* 20

2*2 2 * 10

2 *5

We are breaking the numbers into primes

2*2*2*2*5

3 0

3 years ago

Solve the system of equations by finding the reduced row-echelon form of the augmented matrix for the system of equations.

hram777 [196]

Write the system in augmented-matrix form:

$\left[\begin{array}{ccc|c}2&2&4&16\\5&-2&3&-1\\1&2&-3&-9\end{array}\right]$

Multiply through row 1 by 1/2:

$\left[\begin{array}{ccc|c}1&1&2&8\\5&-2&3&-1\\1&2&-3&-9\end{array}\right]$

Add -1(row 1) to row 3, and add -5(row 1) to row 2:

$\left[\begin{array}{ccc|c}1&1&2&8\\0&-7&-7&-41\\0&1&-5&-17\end{array}\right]$

Swap rows 2 and 3:

$\left[\begin{array}{ccc|c}1&1&2&8\\0&1&-5&-17\\0&-7&-7&-41\end{array}\right]$

Add -7(row 2) to row 3:

$\left[\begin{array}{ccc|c}1&1&2&8\\0&1&-5&-17\\0&0&-42&-160\end{array}\right]$

Multiply through row 3 by -1/42:

$\left[\begin{array}{ccc|c}1&1&2&8\\0&1&-5&-17\\0&0&1&\frac{80}{21}\end{array}\right]$

Add 5(row 3) to row 2:

$\left[\begin{array}{ccc|c}1&1&2&8\\0&1&0&\frac{43}{21}\\0&0&1&\frac{80}{21}\end{array}\right]$

Add -1(row 2) and -2(row3) to row 1:

$\left[\begin{array}{ccc|c}1&0&0&-\frac53\\0&1&0&\frac{43}{21}\\0&0&1&\frac{80}{21}\end{array}\right]$

So the solution to the system is

$x=-\dfrac53,y=\dfrac{43}{21},z=\dfrac{80}{21}$

7 0

4 years ago

Read 2 more answers

The sales tax rate for a local county is 8.7%. If an item costs $184 (before tax), how much sales tax will be due?

DiKsa [7]

16.008 would be the sale tax

3 0

4 years ago

Which of the following describes the correct process for solving the equation 3x + 6 = 21 and arrives at the correct solution?

kozerog [31]

I think the answer is D.

6 0

3 years ago

1 gram = ----- centigrams

Schach [20]

Answer:

100 centigrams!!

Step-by-step explanation:

4 0

3 years ago