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3 years ago

Multiply (5x^2 + x-4(x+2)

Mathematics

1 answer:

bagirrra123 [75]3 years ago

4 0

Answer:

5x^2-3x-8

Step-by-step explanation:

So you will want this to be simplified.

expanding brackets is a great way of doing this

one you have expanded all brackets u get the answer above

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What is the value of the missing exponent?<br> 123,456,789 = 1.23456789 x 10^

mestny [16]

Answer:

$123,456,789 = 1.23456789\times 10^8$

Step-by-step explanation:

It is required to find the value of the missing exponent in the below value i.e.

$123,456,789 = 1.23456789\times 10^x$

Let the exponent is x.

Any number can be written in the scientific notation as :

$N=a\times 10^b$

a is a real number

b is any integer

In this case, the decimal is applied before 8 numbers. It means that the value of x is 8.

6 0

3 years ago

Rainfall collected in a rain gauge was found to be 2.3 cm when rounded to the nearest tenth of a centimeter.

Korolek [52]

Answer:

(a). 2.251 cm , 2.349 cm, 2.295 cm

(b). 0.023 meters.

Step-by-step explanation:

(a). We are asked to to choose the options that shows the actual measurement of the rainfall.

Since the rounded figure is 2.3 cm, this means that either the tenths digit is 3 with hundredths digit less than 5, or tenths digit is 2 with hundredths digit greater than or equal to 5.

Let us check our given choices one by one.

$2.251\text{ cm}\approx 2.3\text{ cm}$

$2.349\text{ cm}\approx 2.3\text{ cm}$

$2.352\text{ cm}\approx 2.4\text{ cm}$

$2.295\text{ cm}\approx 2.3\text{ cm}$

Therefore, the correct choices are 2.251 cm , 2.349 cm and 2.295 cm.

(b) We know that 1 cm equals 0.01 meters.

To convert 2.3 cm to meters, we will multiply 2.3 by 0.01.

$2.3\text{ cm}=2.3\text{ cm}\times \frac{0.01\text{ meters}}{\text{cm}}$

$2.3\text{ cm}=0.023\text{ meters}$

Therefore, the rounded measurement of rain would be 0.023 meters.

8 0

3 years ago

Evalute the expression. 80 + (8x4) divided by 2

dexar [7]

Answer:

If you meant [80 + (8*4) ]/2, then [80 + (8*4) ]/2=56

or if you meant 80 + [ 8*4 / 2], then 80 + [ 8*4 / 2] = 96

Step-by-step explanation:

Evalute the expression. 80 + (8x4) divided by 2

so do you mean

the whole expression 80 + (8x4) is over 2 ?

If so then:

evaluate 8x4 = 8 * 4 = 32.

so we have 80 + (8x4) is over 2 = (80 + 32)/2 = 112/2 = 56

If you meant 80 + [ 8*4 / 2]

then 80 + [ 8*4 / 2] = 80 + 8*2 = 80 + 16 = 96

4 0

4 years ago

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Ostrovityanka [42]

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3 years ago

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