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3 years ago

Half a number increased by seven is -2 find the number.

Mathematics

1 answer:

lana66690 [7]3 years ago

7 0

Number=x
1/2x+7=-2
1/2x=-2-7
=-9
x=-18

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What is the length of line BC , rounded to the nearest tenth?

GuDViN [60]

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3 years ago

Estimate the quotients using compatibale numbers. 8631÷10

FrozenT [24]

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4 years ago

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igomit [66]

Answer:

60cm

Step-by-step explanation:

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3 years ago

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Step-by-step explanation:

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3 years ago

The length and width of a rectangle are measured as 55 cm and 49 cm, respectively, with an error in measurement of at most 0.1 c

valentina_108 [34]

Answer:

The maximum error in the calculated area of the rectangle is $10.4 \:cm^2$

Step-by-step explanation:

The area of a rectangle with length $L$ and width $W$ is $A= L\cdot W$ so the differential of <em>A</em> is

$dA=\frac{\partial A}{\partial L} \Delta L+\frac{\partial A}{\partial W} \Delta W$

$\frac{\partial A}{\partial L} = W\\\frac{\partial A}{\partial W}=L$ so

$dA=W\Delta L+L \Delta W$

We know that each error is at most 0.1 cm, we have $|\Delta L|\leq 0.1$ , $|\Delta W|\leq 0.1$ . To find the maximum error in the calculated area of the rectangle we take $\Delta L = 0.1$ , $\Delta W = 0.1$ and $L=55$ , $W=49$ . This gives

$dA=49\cdot 0.1+55 \cdot 0.1$

$dA=10.4$

Thus the maximum error in the calculated area of the rectangle is $10.4 \:cm^2$

4 0

3 years ago