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3 years ago

Select the all numbers below which are rational numbers.

Mathematics

2 answers:

AfilCa [17]3 years ago

8 0

-76

10.030030030030030...

0.625

18.310

square root 0.25

5/9

tigry1 [53]3 years ago

5 0

Answer:

-76, 10.030030003, .625, 18.310, and 5/9 are rational numbers

Step-by-step explanation:

Rational Numbers can be expressed as p/q, and if they go on forever they repeat. Pi and the Square Roots are irrational as they can't be expressed as a fraction and don't have any pattern when they go on forever.

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5. During the eruption of Mount St. Helens in 1980. debris was ejected at a speed of over 440 feet per second

skelet666 [1.2K]

Answer:

3500 ft

Step-by-step explanation:

We assume you intend the equations to be ...

$y(t)=-16t^2+425t+8200\\x(t)=113t$

Then we can solve the second equation for t and use that in the first equation. We can solve the first equation for y=6000.

x = 113t

t = x/113

y(t) = y(x/113) = -16(x/113)² +425(x/113) +8200 = 6000

(16/12769)x² -(425/113)x -2200 = 0 . . . . . . subtract 6000, multiply by -1

Using the quadratic formula, the positive solution is ...

x = ((425/113) +√((-425/113)² -4(16/12769)(-2200))/(2(16/12769))

The fraction in the denominator can be inverted and used as a multiplier. We also use a√b = √(a²b) to simplify the radical.

x = (48025 +√4104275825)/32

x ≈ 3502.8

Rock was thrown about 3500 feet horizontally.

7 0

2 years ago

Help me please. Solve this equation with the steps. -5•10^x=-31. Thank you

Sonbull [250]

Answer:

$x=0.79$

Step-by-step explanation:

we have

$-5(10^{x})=-31$

step 1

Divide by -5 both sides

$10^{x}=31/5$

step 2

Apply log both sides

$log[10^{x}]=log[31/5]$

step 3

Applying Property of logarithms

Remember that

$log(x^{y})=ylog(x)$

$xlog[10]=log[31/5]$

Remember that

$log(10)=1$

substitute

$x=log[31/5]$

$x=log(6.2)$

$x=0.79$

5 0

2 years ago

Kim, Laura and Molly share £385

Feliz [49]

We let x = Kim's amount
y = Laura's amount
z = Molly's amount

We have three unknowns and it should be that we have three equations to set up to be able to solve this.

x + y + z = 385 (1)
z - x = 105 (2)
2/5 = x/z (3)

Solving simultaneously, we can get the values as follows:

x = 70
z = 175
y = 140

Therefore, the percentage that Laura got was 36.4% of the whole money. Hope this answers the question.

3 0

3 years ago

Please help me with question 1.

muminat

Answer:

C =66

Step-by-step explanation:

4 0

2 years ago

Read 2 more answers

20 points, help me, please !!!!!

mrs_skeptik [129]

(a) |-9| + 6 = 9 + 6 = 15

(b) |-9 + 6| = |-3| = 3

6 0

2 years ago