Вариант I 1. В школьной столовой обед стоит 180 рублей и состоит из трех блюд. Цена первого блюда составляет \( 25 \% \) от стоимости всего обеда, цена второго блюда составляет \( 30 \% \) от стоимости всего обеда. Сколько рублей стоит третье блюдо?

\( \frac { 9 } { 10 } , \frac { 2 } { 5 } \frac { 5 } { 7 } \frac { 3 } { 49 } \frac { 11 } { 13 } , \frac { 11 } { 15 } \)

Example 3. If forces \( l \overrightarrow{A B}, m \overrightarrow{B C}, l \overrightarrow{C D}, m \overrightarrow{D A} \) acting along the sides of a quadrilateral are equivalent to a couple, show that either \( l=m \) or \( A B C D \) is a parallelogram.

Write 0.45 as a fraction in its lowest term

Solve the equation and check the result. \[ \frac{14-7 s}{5}=-s+4 \] \( s=\square \)

Use the vertex and intercepts to sketch the graph of the quadratic function. Give the equation for the parabola's axis of symmetry. Use the graph to determine the function's domain and range. \( f(x)=2 x^{2}+4 x-1 \) What is the vertex? \( (-1,-3) \) (Type an ordered pair.) What are the \( x \)-intercepts? (Type an ordered pair. Use a comma to separate answers as needed. Round to the nearest hundredth as needed.)