3 years ago

PLEASE HELP IM TIMED

Mathematics

1 answer:

seropon [69]3 years ago

7 0

Answer:

first one = 15x+30y-220

second one = 2.4x-4.4

Step-by-step explanation:

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The mean of three number is 15. if 2 of the numbers are 18 and 16 what is the third number

MrMuchimi

Answer:

Step-by-step explanation:

The mean is calculated as

mean = $\frac{sum}{count}$

let the third number be x , then

$\frac{18+16+x}{3}$ = 15 ( multiply both sides by 3 to clear the fraction )

34 + x = 45 ( subtract 34 from both sides )

x = 11 ← third number

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3 years ago

What is the value of the expression below when y=2 6y^2 +8y-9

Annette [7]

Answer:

6y^2+7

Step-by-step explanation:

when you put in the two for y you get tour answer. i tried to simplify it down to the simplest form.

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2 years ago

PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!

Serggg [28]

The answer would be 53. This can be found by add 127 twice (xy and uz) and subtracting it from 360. This would give you 106 and you would divide it by 2 for the 2 angles left and get the answer.

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3 years ago

Suppose you like to keep a jar of change on your desk. Currently, the jar contains the following: 2323 Pennies 55 Dimes 2020 Nic

GaryK [48]

Answer:

The answer is "0.081"

Step-by-step explanation:

Dimes $= 55$

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P(for a dime) $= \frac{55}{117}$

Calculating remaining coins $= 116$

Nickels $= 20$

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P(for a dime after that a nickel, without replacement)

$= \frac{55}{117} \times \frac{20}{116} \\\\= \frac{1100}{13572} \\\\=0.081$

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3 years ago

What is the perimeter of a triangle with 3 sides that measure 8 ft, 20 ft, 12 ft

Darya [45]

Answer:

40 ft

Step-by-step explanation:

Perimeter is the sum of all 3 sides of a triangle.

For this particular triangle, add 8+20+12:

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3 years ago

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