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miss Akunina [59]

3 years ago

10

What is the solution set for 9x2-25 = 0?

1 answer:

Ronch [10]3 years ago

3 0

Answer:

I believe is A.

Step-by-step explanation:

9x^2 - 25 = 0

9x^2 = 25

x^2 = 25/9

x = 5/3

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Why there is 60 minutes in a hour ?

VARVARA [1.3K]

Step-by-step explanation:

THE DIVISION of the hour into 60 minutes and of the minute into 60 seconds comes from the Babylonians who used a sexagesimal (counting in 60s) system for mathematics and astronomy. They derived their number system from the Sumerians who were using it as early as 3500 BC.

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3 years ago

Read 2 more answers

Please help me its about Solving by substitution

Len [333]

Step-by-step explanation:

x=y+7

3x+2y=6

so wherever you see X you but y+7

3(y+7)+2y=6

3y+21+2y=6

group like terms

3y+2y=6-21

5y=-15

divide by 5

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4 0

3 years ago

Find the value of x. Round to the nearest degree

ValentinkaMS [17]

Answer:

b. 44°

Step-by-step explanation:

Reference angle = x

Hypotenuse = 21

Adjacent = 15

Apply trigonometric function CAH:

$Cos(x) = \frac{Adj}{Hyp}$

$Cos(x) = \frac{15}{21}$

$x = cos^{-1}(\frac{15}{21})$

x = 44.4153086° ≈ 44° (nearest degree)

3 0

3 years ago

Express the ratio 14 inches to 3 feet as a fraction in simplest form

prisoha [69]

If then to Sheila If then to Sheila racial the door of the elevator open then you walk into a beautiful place in nature

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3 years ago

the depth D, in inches, od wsnow in my yard t hours after it started snowing this morning is given by D=1.5t + 4. if the depth o

Blababa [14]

Answer:

8.5 inches

Step-by-step explanation:

First let's find the time t when the depth of the snow is 7 inches.

To do this, we just need to use the value of D = 7 then find the value of t:

$7 = 1.5t + 4$

$1.5t = 3$

$t = 2\ hours$

We want to find the depth of snow one hour from now, so we just need to use the value of t = 3 to calculate D:

$D = 1.5*3 + 4$

$D = 4.5 + 4 = 8.5\ inches$

The depth of snow one hour from now will be 8.5 inches.

7 0

3 years ago