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noname [10]
2 years ago
9

Please help I will give you a brainliest

Mathematics
1 answer:
LUCKY_DIMON [66]2 years ago
4 0
Look at the picture attached

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If –2 and –5 are the roots of the equation ax + bx + 20 = 0, find the values of a and b.​
WITCHER [35]

Answer:

a=2

b=14

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
The lengths of the bases of the right trapezoid are 9 cm and 18 cm. The length of a longer leg is 15 cm. Find the area of the tr
finlep [7]

Firstly, we will draw figure

now, we will draw a altitude from B to DC that divides trapezium into rectangle and right triangle

because of opposite sides of rectangle ABMD are congruent

so,

DM=AB=9

CM=CD-DM

CM=18-9

CM=9

now, we can find BM by using Pythagoras theorem

BM=\sqrt{BC^2-CM^2}

now, we can plug values

we get

BM=\sqrt{15^2-9^2}

BM=12

now, we can find area of trapezium

A=\frac{1}{2} (AB+CD)*(BM)

now, we can plug values

and we get

A=\frac{1}{2} (9+18)*(12)

A=162cm^2

so, area of of the trapezoid is 162cm^2..........Answer

6 0
3 years ago
Write the rule for the following arithmetic sequence: 11, 15, 19, 23, …
miv72 [106K]
11,15,19,23

an = 11 + 4(n-1)
an = 11 + 4n - 4
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5 0
3 years ago
In an experiment you do a chi-square test comparing observed and expected progeny. Your calculated chi square is 0.375. With 1 d
myrzilka [38]

Answer:

It mean that the observed progeny is similar than the expected progeny. There is no a relationship between the categorical variables.

Step-by-step explanation:

The Chi-squared test is used to test the relationship between categorical variables. A categorical variable is a non-numerical variable. The null hypothesis of the Chi-squared test is that categorical variables are independent; it means that the frequencies are not dependent on the variable. It is important to know that the Chi-squared test does not measure causality, it only measures the relationship. To reject the null hypothesis, you usually need a probability lower than 0.05, but in this case, the probability was way higher than 0.05, it was between 0.5 and 0.9.

4 0
3 years ago
A store pays$344 for a chandelier and marks the price up by
Yanka [14]
The answer is 481.60000  
 
 
 





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3 years ago
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