Simplify (3a

4 – 2a

2

+ 5a – 10) – (2a

4

+ 4a

2

+ 5a – 2).

a. a

4

+ 4a

2

+ 10a – 12

b. a

4

+ 2a

2

+ 10a – 12

c. 5a

4

+ 4a

3

+ 3a

2

+ 10a – 12

d. a

4 – 6a

2 – 8

(3a^4 – 2a^2 + 5a – 10) – (2a^4 + 4a^2 + 5a – 2)
= 3a^4 – 2a^2 + 5a – 10 – 2a^4 - 4a^2 - 5a + 2
= a^4 - 6a^2 - 8

Answer: d. 39 cmin the diagram, the approximate length of the minor arc de is 39 centimetres.step-by-step explanation: the formula for the length of an arc in a circle is as displayed below.let the length of the minor arc de = xx = 2( pi )r × angle of sector / 360°from this, we will substitute the values given from the problem into the formula to obtain the length of the minor arc de.x = 2( pi )r × angle of sector / 360°r = radius = 25cmpi as an approximate value = 3.14angle of sector = 120°x = 2( 3.14 )( 25 ) × 120° / 360°x = 157 × 1 / 4x = 39.25x = 39 ( rounded to the nearest whole number as an approximate value )