78, because you have to do the inverse operation so 80/2= 40 then 40-1= 39 and 39*3 = 78
Answer: -4/7
Step-by-step explanation:
To find the slope, let's change the equation to slope-intercept form.
[subtract both sides by 4x]
[divide both sides by 7]

Now, we know the slope is -4/7.
Answer:
slope =1
Step-by-step explanation:
hope it help you
Answer: A 2.7 x 10^9
Explanation: brain go brrrrr
Answer:
f = 1
Step-by-step explanation:
Use the method of cross- multiplication
=
⇒ ad = bc, thus
20f = 5(f + 3) ← distribute
20f = 5f + 15 ( subtract 5f from both sides )
15f = 15 ( divide both sides by 15 )
f = 1