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3 years ago

Simply the expression below using order of operations (5^2 -6^2)+5(8-12 ÷3)

Mathematics

1 answer:

Kamila [148]3 years ago

3 0

Answer:

Step-by-step explanation:

The first operation is what inside the braces

1-first comes the multiple and the division

2- then the + and the -

1- (25-36)+5(8-4)

2- (25-36) + 5×4

3- (-11) + 20 =9

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3 years ago

Please help with number 20

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Answer:

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3 years ago

Y is directly proportional to x when y=30, x=6

rosijanka [135]

Answer:

a) y = 5x

b) y = 60

Step-by-step explanation:

Since, y is directly proportional to x when y=30, x=6

$\therefore \: y \: \alpha \: \: x \\ \therefore \: y = kx ...(1) \\ plug \: y = 30 \: and \: x = 6 \: in \: eq \: (1)\\ 30 = k \times 6 \\ k = \frac{30}{6} \\ k = 5 \\ plug \: k = 5 \: in \: (1) \\ y = 5x....(2) \: (required \: equation) \\ plug \: x = 12 \: in \: eq \: (2) \\ y = 5 \times 12 \\ \huge \red{ \boxed{y = 60}}$

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3 years ago

-18x + 20y = 12 -9x + 10y = 6 X=what Y=what

Maksim231197 [3]

Answer:

x is 2.25 and y is 1

Step-by-step explanation:

-18*2.25 = -8

20*1 = 20

-8 + 20 = 12

-9*2.25 = 4

10*1 = 10

-4 + 10 = 6

X = 2.25

Y = 1

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3 years ago