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3 years ago

What is the first step in evaluating the expression shown below? (12.9-3.1) 6.2-2 + 43

Mathematics

1 answer:

Nata [24]3 years ago

3 0

Answer:

Subtract 3.1 from 12.9

Hope it helped

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Dan was thinking of a number. Dan doubles it and gets an answer of 34.7. What was the original number?

Ksju [112]

347/2 just did it!!! Good luck

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3 years ago

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This person did something wrong and I do not know what it is :( Please help this is for points!

Arlecino [84]

Answer:

0.4 cm

Step-by-step explanation:

The magnifying glass basically zooms into smaller objects. If the insect appears to be 2cm, then it is actually smaller than this. It cannot be 10 cm.

If the scale factor is 5, then this means that the insect is zoomed in 5 times through the magnifying glass. Use the following ratio:

$\frac{2}{5}$

This fraction can also be seen as division, so:

$2$ ÷ $5=0.4$

The insect is actually 0.4 cm long.

(or 4 millimeters)

:Done

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3 years ago

Do the ratios 42/56 and 56/64 form a proportion?<br> if they do explain your answer

Volgvan

Lets check...

42/56 = 56/64
cross multiply
(56)(56) = (42)(64)
3136 = 2688...(incorrect)...these are not proportional

proportions are nothing but equivalent fractions
42/56 = 3/4
56/64 = 7/8
as u can see, they are not equivalent fractions...so they are not proportional

4 0

3 years ago

The Surface Area of this cylinder rounded to the nearest square

kipiarov [429]

Answer:

1728

Step-by-step explanation:

2 $\pi$ r h

2 $\pi$ (11) × 14

968

B= $\pi r^{2}$

B= $\pi$ 11^2 =121 $\pi$

S=2 $\pi$ rh + 2 $\pi r^{2}$

S=968 +2 x 121

S=968 +242 $\pi$ = 1728

6 0

3 years ago

2-5(h+3)=-28 What does h equal? SHOW YOUR WORK

fiasKO [112]

3(x+1) = 2(x-8) + 3. First, remove the parentheses by distributing (multiplying out the numbers):

3x + 3 = 2x - 16 + 3.

Then, combine any like terms on the same side of the equals sign;

3x + 3 = 2x -13.

Then, move the like terms on opposite sides of the equals sign to the same side of the equals sign (don't forget to change the signs)..

3x -2x = -13 - 3.

Then combine the like terms on the same side of the equals sign again.. x = -16 .

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3 years ago

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