Camila is training for a triathlon race. Camila's watch recorded that her heart beat 90 times in 30 seconds while biking, and 70 times in 20 seconds while swimming. Which activity made Camila's heart beat faster?

2.1 Simplify the following expression 2.1.1 Add: \( -4 x+6+11 x-5 \) 2.1.2 Multiply: \( 3(x-1)-4(x-2) \) 2.1.3 Calculate the value of \( 2 x^{2}-4 \) if \( x=3 \) 2.2 Simplify the following 2.2.1 \( \frac{(5 x)^{3} y \times\left(2 x y^{2}\right)^{2}}{15 x^{5} y^{2}} \) 2.2.2 \( \frac{2 x+4 y}{x+2 y} \) 2.3 Factorise fully 2.3.1 \( x^{2}-x-6 \)

A line with a slope of -9 passes through the point \( (9,5) \). What is its equation in point-slope form? Use the specified point in your equation. Write your answer using integers, proper fractions, and improper fractions. Simplify all fractions. Submit

Find all exact solutions on the interval \( 0 \leq x<2 \pi \). If there is more than one answer, enter them as a comma separated list. \( \csc ^{2}(x)-4=0 \)

\( x>-1 \) or \( y \geq 1 \)

\( \int \frac { \sqrt { x ^ { 2 } - 9 } } { x } d x = \)