Answer:
100
Step-by-step explanation:
Given : 
To Find : the value of expression 5a.
Solution :
We are given the value of 'a' i.e. a=20
Now to find the value of given expression 5a
⇒
put a = 20 in the equation
⇒
⇒
⇒
Thus , The value of expression 5a when a = 20 is 100
Let x represent the number:
2/3(x)+15=9
2/3(x)= -6
x= -6/(2/3)
x= -6*(3/2)
x= -9
Answer:
y = mx
Step-by-step explanation:
= x ( multiply both sides by m to clear the fraction )
y = mx
Answer:
B
Step-by-step explanation:
Using the rule of exponents
× 
= 
= 1
Given
× 
= 
= 
= 1 → B
Bring the 7 over to the other side, so you have 4x²-12x-7. Then: (2x-7)(2x+1)
X= 7/2 and -1/2
