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rusak2 [61]
3 years ago
10

Please help me out !

Mathematics
2 answers:
hjlf3 years ago
7 0

Answer:

a) \frac{-9}{-10}       b) \frac{-3}{5} , -\frac{3}{5}

Step-by-step explanation:

a) Since the fraction you are dealing with, \frac{9}{10} , is positive, we will need to find a fraction that has either two negative numbers or two positive numbers. The first option, -\frac{9}{10} , the entire fraction is negative, which does not match the given fraction. The second option, \frac{-9}{10} , only one number is negative, and that does not match either. The third option, \frac{9}{-10} , is the same as the second option, only one negative number. However the last option, \frac{-9}{-10} , has both a negative number in the numerator and denominator which both cancel out to \frac{9}{10}, making the fraction positive.

b) The fraction we are dealing with here, \frac{-3}{5} , is negative, so we need to find a fraction that has only one negative number. The first option, \frac{3}{5} , has no negative numbers, making it positive, which does not match. The second option, \frac{3}{-5} , has one negative number, which matches our fraction. The third fraction, \frac{-3}{-5} has two negative numbers making the fraction \frac{3}{5}, positive, which does not match. Then the last option, -\frac{3}{5} the whole fraction is negative which matches our fraction.

Ahat [919]3 years ago
3 0

Answer:

a) -9/-10 (4th)

b) -3/5 (4th)

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The original price of a pair of headphones is $39.99 before tax. When David bought the headphones they rang up for $31.99 before
aleksley [76]

Answer:

To find the sales tax multiply the purchase price by the sales tax rate. Remember to convert the sales tax rate from a percent to a decimal number. Once the sales tax is calculated, it is added to the purchase price. The result is the total cost—this is what the customer pays.

Step-by-step explanation:

8 0
3 years ago
If 24, x, and 6 form the first three terms of an arithmetic sequence
AveGali [126]
<h3>Answer:  15</h3>

===============================================

Work Shown:

d = common difference

p = first term = 24

q = second term = a+d = 24+d

r = third term = q+d = 24+d+d = 24+2d = 6

------------

Solve for d

24+2d = 6

2d = 6-24

2d = -18

d = -18/2

d = -9

We add -9 to each term to get the next term. This is the same as subtracting 9 from each term to get the next term.

------------

First term = 24

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We get the sequence 24, 15, 6

7 0
3 years ago
I need an equation that has variables on both sides were x = 17
Andrei [34K]

3 (3 + x) = 5x - 25

9 + 3x = 5x - 25

Add 25 to each side

34 + 3x = 5x

Subtract 3x from each side

34 = 2x

Divide each side by 2

17 = x

5 0
3 years ago
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Sati [7]
I believe it’s a negative slope
7 0
3 years ago
Tennis elbow is thought to be aggravated by the impact experienced when hitting the ball. The article "Forces on the Hand in the
Gnoma [55]

Answer:

Step-by-step explanation:

Hello!

The objective is to study whether there is a greater force after impacting on one- handed backhand drive in advanced tennis players than in intermediate tennis players.

Sample 1: Advanced tennis players

X₁: Force (N) on the hand just after impact on a one- handed backhand drive for an advanced tennis player.

n₁= 6

X[bar]₁= 40.29 N

S₁= 11.29

Sample 2: Intermediate players

X₂: Force (N) on the hand just after impact on a one- handed backhand drive for an intermediate tennis player.

n₂= 8

X[bar]₂= 21.40

S₂= 8.30

Assuming that both variables have a normal distribution and both population variances are equal, to compare these two populations is best to do so trough their population means using a t-test for independent samples.

If the force is greater for the advanced players than for the intermediate players, then you'd expect the population mean for the advanced players to be greater than the population mean for the intermediate players:

H₀: μ₁ ≤ μ₂

H₁: μ₁ > μ₂

α: 0.05

t= \frac{(X_[bar]_1-X[bar]_2)-(Mu_1-Mu_2)}{Sa\sqrt{\frac{1}{n_1} +\frac{1}{n_2} } } ~~t_{n_1+n_2-2}

Sa= \sqrt{\frac{(n_1-1)S_1^2+(n_2-1)S_2^2}{n_1+n_2-2} } = \sqrt{\frac{5*127.51+7*68.92}{6+8-2} }= 9.66

t_{H_0}= \frac{(40.29-21.40)-0}{9.66\sqrt{\frac{1}{6} +\frac{1}{8} } } = 3.62

Using the p-value approach, the decision rule is

If p-value ≤ α, reject the null hypothesis

If p-value > α, do not reject the null hypothesis

The p-value for this test is 0.00024, it is less than the level of significance, so the decision is to reject the null hypothesis.

This means that at a 5% significance level you can conclude that the average force experienced on the hand after a one-handed backhand drive for advanced players is greater than the average force experienced on the hand after a one-handed backhand drive for intermediate players.

I hope this helps!

3 0
4 years ago
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