2x + y = 5
x − 2y = 10

y = 5 − 2x
x − 2(5 − 2x) = 10
x − 10 + 4x = 10
5x − 10 = 10 When he added in both sides, he subtracted 10 from 10,
5x = 20 instead of adding 10 from 10 to make 20.
x = 4
2(4) + y = 5
8 + y = 5

y = -3

4 0

3 years ago

Twenty of the 25 students in Mrs. Thigpen’s class are we wearing sneakers. What is the fraction in simplest form?

fredd [130]

Answer:

4/5

Step-by-step explanation:

20/25 = 4/5

4 0

3 years ago

5 miles= km. how many km in 250 miles

horsena [70]

Using that 1 mile = 1,6 km so 5 miles = 5*1,6 = 8 km

and 250 miles = 250*1,6 = 400 km

5 0

3 years ago

1; 4; 16; 64; ...<br>what is the general term

Alborosie

Given:

The sequence is

1, 4, 16, 64

To find:

The general term of the given sequence.

Solution:

We have, the sequence

1, 4, 16, 64

Here, the ratio between two consecutive terms is same. So, it is a geometric sequence.

First term is:

$a=1$

Common ratio is:

$r=\dfrac{a_2}{a_1}$

$r=\dfrac{4}{1}$

$r=4$

The nth term of a geometric sequence is

$a_n=ar^{n-1}$ ...(i)

Where, a is the first term and r is the common ratio.

Putting a=1 and r=4 in (i), we get

$a_n=(1)(4)^{n-1}$

$a_n=4^{n-1}$

Therefore, the general term of the given sequence is $a_n=4^{n-1}$ .

8 0

3 years ago