MATHEMATICS HIGH SCHOOL

90 is 50% of what number? Answer choices are 45, 120, ,180

Answers

Answer 1
Answer:

The number whose 50 percent is 90 is 180.

We have,

Equation:

Number x 50% = 90

And,

50% = 50/100 = 0.5

Divide both sides of the equation by 50%

Number = 90 / 0.5

Number = 180

Cross-checked the number.

50% of 180

= 50/100 x 180

= 0.5 x 180

= 90

Therefore,

The number whose 50 percent is 90 is 180.

Learn more about percentages here:

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Answer 2
Answer: The answer is 180 bc 50% is half and 90 is half of 180.

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Solve, using the substitution method.4x + 2y = 11
x – 2 = – 2y


A.


B.


C.


D.

Answers

4x+2y=11 \nx-2=-2y \n \n\hbox{from the 2nd equation:} \nx-2=-2y \nx=-2y+2 \n \n\hbox{substitute -2y+2 for x in the 1st equation:} \n4(-2y+2)+2y=11 \n-8y+8+2y=11 \n-8y+2y=11-8 \n-6y=3 \ny=-(3)/(6)=-(1)/(2) \n \n\hbox{solve one of the equations for x:} \nx=-2 \cdot (-(1)/(2)) +2=1+2=3 \n \n \hbox{the answer:} \n x=3 \n y=-(1)/(2)
4x + 2y = 11
x - 2 = -2y
First you have to get a variable alone in one of the equations.

x - 2 = -2y
   +2    +2
--------------
x = -2y + 2
Next you substitute -2y +2 for x in the second equation.

4(-2y + 2) + 2y = 11
Distribute. 

-8y + 8 + 2y = 11
Combine like terms.

-6y + 8 = 11
Get the variable (y) by itself.

-6y + 8 = 11
       -8    -8
--------------------
-6y = 3
Finally get y by itself.

-6y = 3
-----   ------
-6      -6

Y = 0.5

Now to get x you plugin the answer for y.

x - 2 = -2y
x - 2 = -2(0.5)
x - 2 = -1
   +2     +2
x = 1

(1, 0.5) Is your ordered pair. :D

A rectangle has an area of 112 square units. If its width was half as long and its length was 8 times as long, what would be its new area?

Answers

Area (rectangle)=lenght x width
lenght=x
width=y
xy=112 u²

Then
(y/2)(8x)=4xy
Therefore:
xy=112 u²  then  4xy=4(112 u²)=448 u²

answer: the new area would be 448 u²

For the first 500 minutes used each month, the customer is charged a flat rate of $50. These 500 minutes are "included" in their monthly plan.For any additional minutes used, the customer is charged an additional $.10 per minute.
Is it linear

Answers

yes. goes up 10 constantly

write an expression that shows how you can multiply 9*475 using expanded form and the distributive property

Answers

475 = 400 + 70 + 5

therefore

9 × 475 = 9 × (400 +70 + 5) = 9 × 400 + 9 × 70 + 9 × 5
=3600 + 630 + 45 = 4275

I think... It's better to use Distributive Property:
(a - b) × c = a × c - b × c

9 = 10 - 1

therefore:
(10 - 1) ×475 = 10 × 475 - 1 × 475 = 4750 - 475 = 4275

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Answers

solutions are intersection points, basically they are the values that satisfy both equations which happen to be the points in common or interseciton points

we see that the line intersects the circle in 2 places
2 solutions

A

How do you write 21 in scientific notation?

Answers

Answer:21 = 2.1 × 101

Step-by-step explanation:
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