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juin [17]
2 years ago
6

A.a + b.b = 612 And a+b = 30 so a.b? Pls help.

Mathematics
1 answer:
yawa3891 [41]2 years ago
4 0

Answer:

ab = 144

Step-by-step explanation:

Assuming you mean a² + b² = 612, then

(a + b)² = a² + 2ab + b² , that is

30² = a² + 2ab + b²  , so

a² + 2ab + b² = 900

a² + b² + 2ab = 900 ← substitute a² + b² = 612

612 + 2ab = 900 ( subtract 612 from both sides )

2ab = 288 ( divide both sides by 2 )

ab = 144

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5 0
3 years ago
Read 2 more answers
Part A: Max rented a motorbike at $465 for 5 days. If he rents the same motorbike for a week, he has to pay a total rent of $625
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(5,465)(7,625)
slope(m) = (625 - 465) / (7 - 5) = 160/2 = 80

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use either of ur points (5,465)...x = 5 and y = 465
now we sub and find b, the y int
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equation is : y = 80x + 65...but we need it in standard form
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-80x + y = 65...multiply by -1 to make x positive
80x - y = -65 <== standard form
========================
function notation.....f(x) is the same as y

so y = 80x + 65 in function notation becomes f(x) = 80x + 65
=======================
x axis will be days rented
y axis will be total cost

to graph :
y = 80x + 65.....the slope here is 80...the y int is (0,65)

to find the x int, sub in 0 for y and solve for x
0 = 80x + 65
-80x = 65
x = - 65/80 = - 13/16....so ur x int is (-13/16,0)

and if u need to find more points on ur line....
80x - y = -65....sub in any number for x, and solve for y
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