Cox Engineering performs cement core tests in its laboratory. The following standards have been set for each core test performed: Std. Hours or Quantity Std. Price or Rate Direct materials 3 pounds $0.75 per pound Direct labor 0.4 hours $12 per hour During March the laboratory performed 2,000 core tests. The following events occurred during March: 8,600 pounds of sand were purchased at a cost of $7,310. 7,200 pounds of sand were used for core tests. 840 actual direct labor hours were worked at a cost of $8,610. The direct material usage variance for March is:

1200 U

Explanation:

Standard of material usage:

Material required 3 pounds per test

2000 core tests performed

Standard usage : 2,000 test * 3 pound per test = 6000 pounds

Actual usage of material = 7,200

Variance = 1,200 unfavorable.

ans.

heterothermic organisms include those organisms that can switch between homeothermic (having body temperature higher than environment) and poikilothermic (having variation in internal body temperature) strategies.

some migratory birds show heterothermy as they decrease their metabolic rate during cold nights to keep their body temperature low. drop in metabolic rate allows increase in production efficiency of birds that reduces the internal body temperature to make it equal to external cold temperature during cold nights.

thus, the correct answer is 'birds allow their temperature drop in order to increase their production efficiency.'

answer; engaging in effective public relations;