To solve the following system of equations by elimination, which operation would you perform first?
234x+65y=219
1225x+65y=-427
f. addition
g. subtraction
h. multiplication
i. division

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics

1. are the corresponding angles congruent 2. find the ratios of the corresponding sides 3. is triangle jkl congruent to triangle rst? if so what is the scale factor

Is the power produced directly proportional to the wind speed, give reasons for your answer?