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IrinaK [193]
3 years ago
10

Simplify the expression using the order of operations.

Mathematics
2 answers:
Brrunno [24]3 years ago
8 0

Answer:

72

Step-by-step explanation:

7x 6 + 6 x 5

42 + 6 x 5

42 + 30

72

marin [14]3 years ago
8 0

Answer:

72

Step-by-step explanation:

7x6= 42

6x5 =30

42+30=72

or

take 6 out

6(7+5)

6(12)

72

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Answer:

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Step-by-step explanation:

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a _{n} = a + (n - 1) \times d \\ 67 = 13 + (n - 1) \times 3 \\ 67 = 13 + 3n - 3 \\ 67 - 13  + 3 = 3n \\ 57 = 3n \\ 3n = 57 \\  \\ n =  \frac{57}{3}  \\  \\ n = 19

now the sum of the numbers

S _{n} =  \frac{n}{2} (a + l) \\  \\ S _{19}  =  \frac{19}{2}   (13 + 67) \\  \\ S _{19}  =  \frac{19}{2} (80) \\  \\ S _{19}  =  \frac{19}{2}  \times 80 \\  \\ S _{19}  = 19 \times 40 \\ S _{19}  = 760

8 0
3 years ago
Please help with this math question​
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