Translate the words into an algebraic expression or equation. Use x for the unknown number. Do not solve.The sum of four times a number and 9 is equal to the difference of twice the number and 10. Find the number.
A. 4x - 9 = 2x + 10
B. 4(x + 9) = 2x - 10
C. 4x + 9 = 2x - 10
D. 4x + 9 = 2x + 10
Answer: C
Mathematics
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Use integration by parts to establish a reduction formula for the integral.
A. 
= 
cosn-1 x sin x - 
B. 
= cosn-1 x sin x - (n - 1) 
C. 
= - cosn-1 x sin x + (n - 1) 
D. 
= 
cosn-1 x sin x + 
Mathematics
Solve the equation.10r + 7 = 57
A. 5 B. 44 C. 1 D. 40
Mathematics
Solve the problem.Jose Ramirez, a salesperson for a chemical company, travelled 1711 miles on Monday, 429 miles on Tuesday, and 2045 miles on Thursday. Find the total number of miles he travelled during these three days.
A. 3756 mi B. 4185 mi C. 3327 mi D. 4085 mi
Mathematics
Solve the system of equations by the substitution method.-4x + 7y = 592x - 5y = -43
A. {(1, 9)} B. {(1, 10)} C. {(0, 10)} D. ?
Mathematics