3. In a group of 30 children, 13 favored apples only, 8 favored guavas only and 3 favored none of these fruits, by showing in Venn-diagram
(1) Find the ratio of number of children who like both and don't like both the fruits.
(2) What percent of the students like guava?
​

An electronics manufacturer wants to know if customers would be interested in a detachable keyboard for their tables and if so, what the most important features would be. the manufacturer partners with an electronics store to include copies of the survey with every purchase at that store for one week. which of the following best explains why this random sample is unlikely to be a good representative sample of tablet owners' preferences for a detachable keyboard? a) one week is likely not enough time to get a large enough sample. b) most people won't bother to send in the survey, which is likely to skew the results c) there is no way to verify whether the responders to the survey actually own a tablet d) the survey is biased because it was conducted through an electronics store, not the general population

Solve each quadratic equation by factoring and using the zero product property. 14x - 49 = x^2

Given the expression (7 ? 4i) ? (2 + 6i), perform the indicated operation and write the answer in the form a + bi.