Please answer quickly

Question

 Simplify and combining like terms 

 

2.5²+4(2.3n+4.8)-2.8

 

what is the value when 

a equals 1/5

 B equals 5

C equals 1.2

A/b*c(c²- c

Answer 1

For the first part, we simplify using PEMDAS.

 

Parenthesis

Exponents

Multiply / Divide from left to right

Add / Subtract from left to right

 

2.5² + 4(2.3n + 4.8) - 2.8 =

 

6.25 +  4(2.3n + 4.8) - 2.8 =

 

6.25 + 9.2n + 19.2 - 2.8 =

 

9.2n + 22.65

 

 

For the second part, we substitute the given values to the expression given using PEMDAS.

 

A/b *c(c² - c)

 

 

We can factor out the c in parenthesis.

 

A/b * c*c(c - 1) =

 

A/b * c²(c - 1) =

 

 

Plug in the values.

 

(1/5) / (5) * 1.2²(1.2 - 1) =

 

(1/5) / (5) * 1.2²(0.2) =

 

(1/5) / (5) * 1.44(0.2) =

 

(1 / 25) * 0.288 =

 

    0.01152