It's 7th grade might be easy for you
instructions: translate each verbal phrase into an algebraic expression. make sure your final expression is fully simplified and in standard form.

1. twelve more than a number

2. five less than twice a number

3. forty decreased by a number

4. the sum of one-third of a number and twelve

5. 25% of a number

6. the ratio of a number increase by two and four

7. twelve times the difference of a number and one

8. three times the sum of a number and negative eight

9. the product of seven and the sum of twice a number and three

10. the total of two different numbers decreased by thirty

Atechnician compares repair costs for two types of microwave ovens (type i and type ii). he believes that the repair cost for type i ovens is greater than the repair cost for type ii ovens. a sample of 6767 type i ovens has a mean repair cost of $79.79$⁢79.79. the population standard deviation for the repair of type i ovens is known to be $19.18$⁢19.18. a sample of 5555 type ii ovens has a mean repair cost of $75.24$⁢75.24. the population standard deviation for the repair of type ii ovens is known to be $21.40$⁢21.40. conduct a hypothesis test of the technician's claim at the 0.050.05 level of significance. let μ1μ1 be the true mean repair cost for type i ovens and μ2μ2 be the true mean repair cost for type ii ovens. step 2 of 4 : compute the value of the test statistic. round your answer to two decimal places.