3 years ago

Please help me with those 2 question!

Mathematics

1 answer:

posledela3 years ago

3 0

Answer:

Step-by-step explanation:

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P (-2,6), Q (9,6), R (7, -1), S (-4, -1) are the vertices of a quadrilateral.

vova2212 [387]

Step-by-step explanation:

Parallelogram

Reflect y=-1 ;x changes sign

6 0

3 years ago

The average of 10 numbers is -5. A new number is added to the list making the average -6. What is the new number?

Shtirlitz [24]

Answer:

- 16

Step-by-step explanation:

Average is calculated as

average = $\frac{total}{count}$

Thus for the given 10 numbers we have

$\frac{total}{10}$ = - 5 ( multiply both sides by 10 )

total = - 50

let the number added be x, then

$\frac{total+x}{11}$ = - 6 ( multiply both sides by 11 )

total + x = - 66, that is

- 50 + x = - 66 ( add 50 to both sides )

x = - 16

The new number is - 16

4 0

3 years ago

Simplify this algebraic expression completely. 5y - 3(y+ 2)

aliya0001 [1]

Answer:

2y -6

Step-by-step explanation:

5y - 3(y+ 2)

Distribute

5y -3y -6

Combine like terms

2y -6

4 0

3 years ago

D(n)=-5(1/2)^n-1 what is the 3rd term in the sequence

Studentka2010 [4]

Answer:

-1.25

Step-by-step explanation:

Better to write this as

a(n)= -5(1/2)^(n-1)

Then the 3rd term is a(3) = -5(1/2)^(3 - 1), or a(3) = -5(1/2)^2 = -5/4 = -1.25

7 0

3 years ago

511 = -7 (10x – 13) steps

PilotLPTM [1.2K]

Answer: $x=-6$

Simplify both sides of the equation

$511=(-7)(10x)+(-7)(-13)(Distribute)\\511=-70x+91$

Flip the equation

$-70x+91=511$

Subtract 91 from both sides

$-70x+91-91=511-91\\-70x=420$

Divide both sides by -70

$-70x/70=420/-70\\x=-6$

3 0

3 years ago

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