The table below shows the number of textbooks placed in a stack and the height of the stack. number of textbooks (x) : 3, 4 , 5
Height (y) : 5.25, 7.00, 8.75

Which equation can be used to calculate the height, y, of a stack of x textbooks?

y = 5.25 + x

y = 5.25x

y = 1.75 + x

y = 1.75x

Solve the system of equations. y= 2x y= x^2 - 15

Determine domain and range, largest open interval, and intervals which function is continuous.

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.