In an examination ,a candidates gets 4 marks for a correct answer and -1 for a wrong answer .If a candidate attempts 35 questions and obtains 100 marks, find the number of questions answered correctly by the candidate.

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

What is the number 321,000,000 in scientific notation? also what is the number? ?

Oscar and julie ashton are celebrating their 15th anniversary by having a reception hall. they have budgeted $4,500 for their reception. if the reception hall charges a $90 cleanup fee plus & 36 per person, find the greatest number of people that they may invite and still stay within their budget.