Solve.Devon received a birthday check for $40.00 from his aunt. He immediately cashed the check and went on a shopping spree. In three different stores he spent $11.21, $11.25, and $6.24, respectively. How much was left of the birthday money after these purchases?
A. $11.30
B. $11.60
C. $28.70
D. $12.30
Answer: A
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Solve the differential equation.x2 
= 6y
A. y = Ce6/x
B. y = Ce- 6x
C. y = Ce- 6/x
D. y = - 
+ C
Solve the problem using determinants.Barges from ports X and Y went to cities A and B. X sent 28 barges and Y sent 8. City A received 20 barges and B received 16. Shipping costs $220 from X to A, $300 from X to B, $400 from Y to A, and $180 from Y to B. $8240 was spent. How many barges went where?
A. 20 from X to A; 8 from X to B; 0 from Y to A; 8 from Y to B B. 18 from X to A; 10 from X to B; 2 from Y to A; 6 from Y to B C. 16 from X to A; 16 from X to B; 4 from Y to A; 4 from Y to B D. 14 from X to A; 14 from X to B; 6 from Y to A; 2 from Y to B
Solve. Write the fraction in simplest form.Linda walked 
mi to the park and then another 
mi to the cafe. How far did she walk in total?
A. 
mi
B. 
mi
C. 
mi
D. 
mi
In order to determine the effects of a new pill that is supposed to reduce hair loss, a researcher conducts a study. Five hundred volunteer subjects (300 men and 200 women) all of which suffer some degree of hair loss are selected to participate in the study. The researcher gives the women the real pill and the men a sugar pill, but only the researcher knows this.In the experiment, which is the placebo group?
A. the 200 women B. the 300 men C. the subjects that responded to the treatment D. There is no placebo group. E. none of these