Evaluate.Let a = (cos ?)i + (sin ?)j , b = 
i + 
j. Find a + b.
A. i - j
B. -i - j
C. -i + j
D. i + j
Answer: B
Mathematics
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Find R2.
´ R1 Ã V1 = E³ ÄÄÄÄÄÄÄ ³. V1 = 15 V, E = 30 V, R1 = 15 Kê. ’ R1 + R2 Å a. 15 Kê b. 45 Kê c. 30 Kê d. 10 Kê e. 40 Kê
Mathematics
Solve the problem.In the following formula, y is the minimum number of hours of studying required to attain a test score of x: 
How many hours of study are needed to score 94?
A. 100.04 hr B. 14.53 hr C. 62.20 hr D. 6.22 hr
Mathematics
Find the determinant of the matrix and determine if the matrix is invertible 
What will be an ideal response?
Mathematics
Solve the formula for the specified variable.P = s1 + s2 + s3 for s2
A. s2 = s1 + P - s3 B. s2 = P - s1 - s3 C. s2 = s1 + s3 - P D. s2 = P + s1 + s3
Mathematics