exam Maths Puzzle Numerical Ability

I bought 2 donuts and 3 lattes yesterday for $6.15, today I bought 3donuts and 4 lattes for $8.35, how much are donuts and how much are lattes? I got latte would be 1.75 donuts .45 am i right?

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exam Other Question

Judith rides her bike 2 mi/h faster than Kelly. Judith takes 48 minutes less to travel 50 mi/h than Kelly. What is each person's distance in miles per hr?

This is in the chapter Write the equation 2x^2-16x-y+24=0 in vertex form.
Find the..
(a) vertex
(b) axis of symmetry
(c) focus
(d) directrix oft the parabola

thank you.