PLSSS HELP IF YOU TURLY KNOW THISS
2 answers:
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Answer:
a. The linear function is given by,
y = 60x + 30 [y is in $ and x is in hour and x ≥ 0.5]
= 60 [for x < 0.5]
b. The total cost of the repair job is, $ 675 .
Step-by-step explanation:
Let, the linear function describing garage charge( y in $) and no. of hours of repair job ( x in hour) be,
y = mx + c [for x ≥ 0.5] -----------(1)
where, m is the slope of the line and c is the y intercept.
Now ,
m =
= 60 ----------------(2)
Now, putting the value of m and the point (x,y) = (0.5, 60) in (1), we get,
$
⇒ c = 30 ----------------- (3)
Hence, the linear function is given by,
y = 60x + 30 [y is in $ and x is in hour and x ≥ 0.5] ------------(4)
= 60 [for x < 0.5]
Now, putting
x = 4 hr 15 min
= hour
= 4.25 hour in (4), we get,
[in $]
= $ 285
So, the total cost of the repair job,
= $ (285 + 390)
= $ 675
Answer:
see below
Step-by-step explanation:
Use the distributive property:
(y^2 +3y +7)(8y^2 +y +1)
= y^2(8y^2 +y +1) +3y(8y^2 +y +1) +7(8y^2 +y +1)
= 8y^4 +y^3 +y^2 + 24y^3 +3y^2 +3y + 56y^2 +7y +7
= 8y^4 +y^3(1 +24) +y^2(1 +3 +56) +y(3 +7) +7
= 8y^4 +25y^3 +60y^2 +10y +7 . . . . . matches the last choice
