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blsea [12.9K]
4 years ago
11

Can x=4 in the expression 3(x-1)=20

Mathematics
2 answers:
Grace [21]4 years ago
8 0

if we take x=4 in the above expression we get,

3(4-1)=20

3×3=20

9≠20

so we can understand that x=4 is not the right value of x

hope it helps you

melamori03 [73]4 years ago
3 0

Answer:

No

Step-by-step explanation:

We are given the equation:

3(x-1)=20

We want to know if x can equal 4. Therefore, we can substitute 4 in for x. If 4 is a solution, then both sides of the equation will be the same.

3(x-1)=20

x=4

3(4-1)=20

Solve inside the parentheses first. Subtract 1 from 4.

3(3)=20

Multiply 3 and 3

9=20

9\neq20

9 is not equal to 20. Therefore, 4 cannot be a solution.

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Answer:

13) Angle A is 30°

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Step-by-step explanation:

By the angle sum theorem for the interior angles of a triangle, we have;

13) 130° + 2·x + 3·x = 180°

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16) x + 79 + x + 49 + 70° = 180°

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2·x = -17°

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x = -8.5°

∠A = x + 49 = (-8.5 + 49)° = 40.5°

∠A = 40.5°.

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Step-by-step explanation:

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Hey there! :D

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~kaikers

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