Use elimination to solve the system of equations.

$$4.25 x-1.28 y=-9.2$$

$$x+1.28 y=17.6$$

Find the angle at the vertex A of the triangle ABC with vertices A=(1, 0, 1), B=(2, -1, 1), and C=(-2, 1, 0).

Determine whether each statement is always, sometimes, or never true. If n is a rational number, then the solutions to

$$x ^ { 2 } = n$$

are rational numbers.

Use elimination to solve the system of equations.

$$2 x+y=3$$

$$-4 x-4 y=-8$$

the points represent the vertices of a triangle. Draw triangle ABC in the coordinate plane A(1, 1), B(2, 4), C(3, 5)

Use elimination to solve the system of equations.

$$4 a+b=2$$

$$4 a+3 b=10$$

What is deforestation?

Use the given information and $\tan ^{-1}$ to find m angle A to the nearest whole number.

tan A/$1+tan A) = 0.5437

Use the given information and $\tan ^{-1}$ to find m angle A to the nearest whole number.

$(tan 5 A)^2$=0.3333

How many moles of magnesium oxide are there in $2.50 \times 10^{25}$ formula units of MgO?

Use elimination to solve the system of equation. x - 4y = 2, 3x + 4y = 38

Is the interaction between an ammonia ligand and a metal cation a Lewis acid-base interaction?

$$If \;\overleftrightarrow{ABC}$$

is a line, which of the following may be false? (1)B is on A̅C̅. (2)A̅B̅ + B̅C̅ = A̅C̅. (3) Bis between A and C. (4)B is the midpoint of AC.

Solve the system by elimination. Check your solution. x + y = 12 3x = 2y + 6