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uranmaximum [27]
3 years ago
7

I cant figure out the answer​

Mathematics
2 answers:
Sedbober [7]3 years ago
5 0

Answer:

18

Step-by-step explanation:

\frac{1}{5} × 60 = 12 ← number who chose basketball

\frac{1}{2} × 60 = 30 ← number who chose volleyball

That is a total of 12 + 30 = 42 students

Since the remaining students chose soccer, then

60 - 42 = 18 ← number who chose soccer

Tcecarenko [31]3 years ago
3 0

Answer: 3/10

Step-by-step explanation: times

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To illustrate the effects of driving under the influence of alcohol, a police officer brought a DUI simulator to a local high sc
nexus9112 [7]

Answer:

Check the explanation

Step-by-step explanation:

Here we have to first of all carry out dependent sample t test. consequently wore goggles first was selected at random for the reason that the reaction time in an emergency taken with goggles would be greater than the amount of reaction time in an emergency taken with not so weakened vision. So that we will get the positive differences d = impaired - normal

b)

To find 95% confidence interval first we need to find sample mean and sample sd for difference d = impaired minus normal.

We can find it using excel that is in the first attached image below,

Therefore sample mean ( \bar{X}_{d} ) = 0.98

Sample sd ( \bar{S}_{d} ) = 0.3788

To find 95% Confidence interval we can use TI-84 calculator,

Press STAT ----> Scroll to TESTS ---- > Scroll down to 8: T Interval and hit enter.

Kindly check the attached image below.

Therefore we are 95% confident that mean difference in braking time with impaired vision and normal vision is between ( 0.6888 , 1.2712)

Conclusion : As both values in the interval are greater than 0 , mean difference impaired minus normal is not equal to 0

There is significant evidence that  there is a difference in braking time with impaired vision and normal vision at 95% confidence level .

7 0
3 years ago
Please need some help with arithmetic functions!!!
frutty [35]
A, perhaps,plz check the definition of functions
8 0
3 years ago
Solve the system with elimination. {2x-y=2, -5x+4y=-2
DaniilM [7]

Answer:

{x=2,y=2

Step-by-step explanation:

Equation 1:

Multiply both sides of the equation by a coefficient

{ 4(2x-y)=2*4

-5x+4y=-2

Apply Multiplicative Distribution Law

{8x-4y=2*4,-5x+4y=-2

8x-4y+(-5x+4y)=8+(-2)

Remove parentheses

8x-4y-5x+4y=8-2

Cancel one variable

8x-5x=8-2

Combine like terms

3x=8-2

Calculate the sum or difference

3x=6

Divide both sides of the equation by the coefficient of the variable

x=6/3

Calculate the product or quotient

x=2

Equation two:

{-5+4y=-2, x=2

-5*2+4y=-2

Calculate the product or quotient

-10+4y =-2

Reduce the greatest common factor (GCF) on both sides of the equation

-5+2y=-1

Rearrange unknown terms to the left side of the equation

2y=-1+5

Calculate the sum or difference

2y=4

Divide both sides of the equation by the coefficient of the variable

y=4/2

y=2

Hope this helps!!

6 0
2 years ago
Is 89 prime or composite
Ratling [72]
It is a prime number. 89=1×89 hope it helps
8 0
3 years ago
A ball is thrown upward from the top of a 192-foot-high building. The ball is 240 feet above ground level after 1 second, and it
iris [78.8K]

Answer:

The equation of this function is h = -16\cdot t^{2}+64\cdot t+192.

Step-by-step explanation:

From Mechanical Physics we must remember that height reached by the ball as a function of time is a quadratic function if and only if ball is uniformly accelerated by gravity and viscous forces and Earth's rotation effects can be neglected. After assuming those considerations as true, the standard form of the quadratic function is:

h = a\cdot t^{2}+b\cdot t + c (Eq. 1)

Where:

t - Time, measured in seconds.

h - Height of the ball, measured in feet.

a - Second order coefficient, measured in feet per square second.

b - First order coefficient, measured in feet per second.

c - Zero order coefficient, measured in feet.

From Algebra, we can obtain a quadratic function by know three distinct points and solving the resulting system of linear equations:

A(t, h)= (0\,s,192\,ft)

c = 192\,ft (Eq. 2)

B(t,h) = (1\,s,240\,ft)

a+b+c = 240\,ft (Eq. 3)

C(t,h) =(6\,s,0\,ft)

36\cdot a + 6\cdot b + c = 0 (Eq. 4)

By Algebraic methods, we get this unique solution:

a = -16\,\frac{ft}{s^{2}}, b = 64\,\frac{ft}{s}, c = 192\,ft

The equation of this function is h = -16\cdot t^{2}+64\cdot t+192.

4 0
3 years ago
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