Beth calculated the cost for tuition and books for 4 years of college will be$31,800. wich expression shows an estimate to check if beth's calculation is reasonable?

arrange the equations with like terms in columns.

analyze the coefficients of x or y.

add the equations and solve for the remaining variable.

substitute the value into either equation and solve.

check the solution.

step-by-step explanation:

dc=6 square root of 3 and ac is 12 square root 3

c and d

step-by-step explanation:

square root of 3/2 = 18/c

cross multiply to get 18*2=√3*c

36/√3 * √3/√3 = c

c= 36*√3/3

c=12√3

20%

step-by-step explanation:

m∠a is 90°

m∠b is 40°