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kirill [66]
2 years ago
7

Factorise 2x^2 +3x -20=0. 25 points!! plsss could someone help :)

Mathematics
1 answer:
aksik [14]2 years ago
5 0

Answer:

(2x - 5) (x + 4)

Step-by-step explanation:

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Harper goes to a store an buys an item that costs x dollars. She has a coupon for 30% off, and then a 6% tax is added to the dis
iragen [17]
Not enough information- the coupon will only be worth 24% after tax though.
5 0
2 years ago
Read 2 more answers
Which of the following is the solution to 17 - 2x=-11?<br> 3<br> -14<br> 14<br> he<br> -3
lesya692 [45]

Answer:

17-2x =-11 I got 14

Step-by-step explanation:

Subtract the 17 from the -11 which will be -28 and then divided -28 by -2 and your answer is 14

3 0
2 years ago
A company surveyed 2400 men where 1248 of the men identified themselves as the primary grocery shopper in their household. ​a) E
polet [3.4K]

Answer:

a) With a confidence level of 98%, the percentage of all males who identify themselves as the primary grocery shopper are between 0.4962 and 0.5438.

b) The lower limit of the confidence interval is higher that 0.43, so if he conduct a hypothesis test, he will find that the data shows evidence to said that the fraction is higher than 43%.

c) \alpha =1-0.98=0.02

Step-by-step explanation:

If np' and n(1-p') are higher than 5, a confidence interval for the proportion is calculated as:

p'-z_{\alpha/2}\sqrt{\frac{p'(1-p')}{n} }\leq  p\leq p'+z_{\alpha/2}\sqrt{\frac{p'(1-p')}{n} }

Where p' is the proportion of the sample, n is the size of the sample, p is the proportion of the population and z_{\alpha/2} is the z-value that let a probability of \alpha/2 on the right tail.

Then, a 98% confidence interval for the percentage of all males who identify themselves as the primary grocery shopper can be calculated replacing p' by 0.52, n by 2400, \alpha by 0.02 and z_{\alpha/2} by 2.33

Where p' and \alpha are calculated as:

p' = \frac{1248}{2400}=0.52\\\alpha =1-0.98=0.02

So, replacing the values we get:

0.52-2.33\sqrt{\frac{0.52(1-0.52)}{2400} }\leq  p\leq 0.52+2.33\sqrt{\frac{0.52(1-0.52)}{2400} }\\0.52-0.0238\leq p\leq 0.52+0.0238\\0.4962\leq p\leq 0.5438

With a confidence level of 98%, the percentage of all males who identify themselves as the primary grocery shopper are between 0.4962 and 0.5438.

The lower limit of the confidence interval is higher that 0.43, so if he conduct a hypothesis test, he will find that the data shows evidence to said that the fraction is higher than 43%.

Finally, the level of significance is the probability to reject the null hypothesis given that the null hypothesis is true. It is also the complement of the level of confidence. So, if we create a 98% confidence interval, the level of confidence 1-\alpha is equal to 98%

It means the the level of significance \alpha is:

\alpha =1-0.98=0.02

4 0
3 years ago
The area of triangle ABC is 24 square centimeters. If B = 30° and a = 6 cm, what is the measure of side c? 4 cm 8 cm 16 cm 32 cm
disa [49]

Answer:

16 cm

Step-by-step explanation:

Given : The area of triangle ABC is 24 square centimeters.

To Find: If B = 30° and a = 6 cm, what is the measure of side c?

Solution:

Formula : Area = \frac{1}{2} \times a \times c \times sin B

a = 6

Area = 24

B = 30°

Substitute the values in the formula

24 = \frac{1}{2} \times 6 \times c \times sin 30

24 = \frac{1}{2} \times 6 \times c \times \frac{1}{2}

24 =3 \times c \times \frac{1}{2}

\frac{24 \times 2}{3} =c

16=c

Hence the measure of side c is 16 cm

So, Option c is correct.

4 0
3 years ago
each interior angle of a regular polygon measures (10x+10) and each exterior angle measures(3x-12) how many sides does the polyg
katrin2010 [14]
Interior angle+exterior angle=180
10x +10 +3x -12 =180
13x-2=180
13X+182
X=14 sides





5 0
3 years ago
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