Can someone please factor this expression for me a²+4a-45​

(a−5)(a+9)

Step-by-step explanation:

(a + 9)(a - 5)

Step-by-step explanation:

Given

a² + 4a - 45

Consider the factors of the constant term (- 45) which sum to give the coefficient of the a- term (+ 4)

The factors are + 9 and - 5 , since

9 × - 5 = - 45 and 9 - 5 = 4 , then

a² + 4a - 45 = (a + 9)(a - 5) ← in factored form

answer:

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

explanation:

service only with 20% tip  

→

$

72.6

(

1

+

20

100

)

=

$

87.12

in the opening of the question the word 'service' is associated only with the pretax value.

the closing part of the question asks: how much did she pay for the  

service

−−−−−−  

so technically the answer is  

→

$

72.6

(

1

+

20

100

)

=

$

87.12

however, the intention of the question provider may have been that your answer is to be  

$

87.12

(

1

+

8

100

)

=

$

94.09

to 2 decimal places.

'

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

tony b

mar 21, 2017

answer:

trying to explain it another way

explanation:

service charge  

.

→

$

72.60

20% tip  

20

100

×

$

72.60

=

$

14.52

−−−−−−  

←

add

$

87.12

tax  

8

100

×

$

87.12

=

$

6.97

−−−−−  

←

add

$

94.09

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step-by-step explanation: