Triangle R Q S is cut by line segment T V. Line segment T V goes from side Q R to side R S. The length of R V is x 10, the length of V S is x, the length of R T is x 4, and the length of T Q is x minus 3. Which value of x would make Line segment T V is parallel to Line segment Q S? 3 8 10 11

Aside form a students id, what is another card a collage student use to obtain discounts

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Raul has one solution that is 20% acid by volume and one solution that is 50% acid by volume. he plans to mix together some of each solution to create 30 milliliters of a solution that is 40% acid by volume. how many milliliters of the 20% acid solution should raul use to create the 40% acid solution? can someone explain this to me? i know that the answer is 10 milliliters, but i don't know how to get it.