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4 years ago

Please help me on this, i dont know how to find the y-value for this type of problem!

Mathematics

1 answer:

ehidna [41]4 years ago

6 0

You multiply 9×7 then you add 1045 and 1125 when you get the answers of 9×7 and 1045+1125 you add them that is your answer

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the sum of the first 20 terms of an A.P is identical to the sum of the first 22 term.If the common difference is -2; find the fi

Goryan [66]

Answer:

First term a = 41

Step-by-step explanation:

Arithmetic Progression:

Common differences d = -2

$S_{n}=\frac{n}{2}(2a+[n-1]d)\\\\S_{20}=\frac{20}{2}(2a+19*[-2])\\\\$

= 10*(2a - 38)

= 10*2a - 10*38

=20a - 380

$S_{22}=\frac{22}{2}(2a+21*[-2])\\\\$

= 11 (2a -42)

=11*2a - 11*42

= 22a - 462

$S_{22}=S_{20}\\\\$

22a - 462 = 20a - 380

22a = 20a - 380 + 462

22a = 20a + 82

22a - 20a = 82

2a = 82

a = 82/2

a = 41

First term a = 41

7 0

3 years ago

In DEF, C is the centroid if DM=45 , find DC and CM DC= ? Units

IgorC [24]

Answer:

DC=30

CM=15

Step-by-step explanation:

Given

Triangle DEF with C centroid

DM=45 (length of median)

centroid divides median in the ratio 2:1(larger side at vertex)

⇒

DC $=\frac{2}{3} \times DM=\frac{2}{3} \times 45= 2\times 15=30$

⇒DC=30

DC+ CM=DM

30+CM=45

⇒CM=15

7 0

3 years ago

Thank you so much for you help

ankoles [38]

Your welcome for the help

8 0

3 years ago

Guys can you please help me with this?? Thanks to whoever helps me

loris [4]

Answer:

188.5 $cm^2$

Step-by-step explanation:

The surface area of a cylinder can be found using the equation: $A=2\pi rh+2\pi r2$ .

When we plug in to this equation we get $2\pi (3)(7) + 2\pi(3^2)$ which equals 188.4955 which can be rounded up to 188.5 $cm^2$

8 0

3 years ago

Which expression is equivalent to R^9/r^3?

Alja [10]

Answer:

r^9/r^3 = r^9-3 = r^6

Step-by-step explanation:

4 0

3 years ago

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