Simplify<br><br> (-3)^1 x (-3)^O

What is the area of angle GHI

steposvetlana [31]

6.4

1/2 * 5.4 * 7.1 sin60

Mark brainliest please

3 0

3 years ago

What is three equivalent ratios for 9/2?

andreyandreev [35.5K]

$\frac{18}{4}; \frac{27}{6}; \frac{36}{8}$

6 0

4 years ago

2x-y=-1 , 3x-y=2 solve by substition

Mazyrski [523]

Answer:

x = 3, y = 7

or (3,7)

Step-by-step explanation:

We are given the system of equations below:

$\large{ \begin{cases} 2x - y = - 1 \\ 3x - y = 2 \end{cases}}$

We are required to solve the system by substitution method. What we have to do is to isolate either x-term or y-term so we can use the method. I will be isolating y-term because it is faster due to having 1 as a coefficient.

By isolating y-term, just pick one of the given equations to isolate. No need to isolate the whole system. (I will be isolating y-term of the first equation.)

$\large{ \begin{cases} y= 2x + 1\\ 3x - y = 2 \end{cases}}$

Then we substitute y = 2x+1 in the second equation.

$\large{3x - (2x + 1) = 2}$

Use the distribution property.

$\large{3x - 2x - 1 = 2}$

Isolate x-term to solve the equation.

$\large{x = 2 + 1} \\ \large{x = 3}$

Since we are solving a system of equations. We have to solve for both x-value and y-value to complete. We have already found x-value, but nor y-value yet. Therefore, our next step is to substitute the value of x that we solved in any given equations. It's recommended to substitute in an equation that doesn't have high coefficient value. So I will be substituting x = 3 in the first equation.

$\large{2x - y = - 1} \\ \large{2(3) - y = - 1} \\ \large{6 - y = - 1}$

Isolate and solve for y-term.

$\large{6 + 1 = y} \\ \large{7 = y} \\ \large{y = 7}$

Since we substitute x = 3 and get y = 7. We can write in ordered pairs as (3,7)

Hence, the solution is (3,7)

7 0

3 years ago

A boy spent 20% of his money on books and 20% of the remainder on food.If he had $2000 left, how much money did he have at first

DENIUS [597]

Answer:

$\$3,125$

Step-by-step explanation:

Let $s$ represent the amount of money he initially started with.

After he spent 20% on books, he will have $100\%-20\%=80\%$ of his initial money left. We can represent this as $0.8s$ .

Following that, the boy spends 20% of the remainder of his money on food. Similarly, he will have $100\%-20\%=80\%$ of the remainder of money he had left after he purchased the books. Therefore, he ends up with $0.8(0.8s)=0.64s$ of his money left.