Answer:
AC = 12.5 cm
Step-by-step explanation:
use cosine law c^2 = a^2 + b^2 − 2ab cos(C)
c^2 = 6^2 + 10^2 - 2(6)(10)(cosin100)
c^2 = 156.84
c= √156.84
c= 12.5 cm
The cosine rule is used when we are given either three sides or two sides and the included angle.
To answer the equation first, let x be the number of pens. With this representation, the number of pencils she bought would be x - 4. The total amount she would have to spent for all the items is,
T = 6.70x + 3.5(x - 4)
Answer:
Use long multiplication to evaluate.
$30.78
Matrices always go row x column.
Count the rows: 4
Count the columns: 3
The matrix is a 4 x 3 matrix