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2 years ago

Write the expression. Then, check all that apply. a number cubed increased by four

Mathematics

2 answers:

nexus9112 [7]2 years ago

5 0

Answer: C and B

Step-by-step explanation: because its rational.

-LearnWithBrainly

GalinKa [24]2 years ago

3 0

C and b i agree hope it helps

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Prove algebraically that r = 10/2+2sinTheta is a parabola

Xelga [282]

Answer:

$y = - \frac{ 1 }{10} {x}^{2} + \frac{5}{2}$

Step-by-step explanation:

We want to prove algebraically that:

$r = \frac{10}{2 + 2 \sin \theta}$

is a parabola.

We use the relations

${r}^{2} = {x}^{2} + {y}^{2}$

and

$y = r \sin \theta$

Before we substitute, let us rewrite the equation to get:

$r(2 + 2 \sin \theta) = 10$

$r(1+ \sin \theta) = 5$

Expand :

$r+ r\sin \theta= 5$

We now substitute to get:

$\sqrt{ {x}^{2} + {y}^{2} } + y = 5$

This means that:

$\sqrt{ {x}^{2} + {y}^{2} }=5 - y$

Square:

${x}^{2} + {y}^{2} =(5 - y)^{2}$

Expand:

${x}^{2} + {y}^{2} =25 - 10y + {y}^{2}$

${x}^{2} =25 - 10y$

${x}^{2} - 25 = - 10y$

$y = - \frac{ {x}^{2} }{10} + \frac{5}{2}$

This is a parabola (0,2.5) and turns upside down.

4 0

3 years ago

Help Please!!! Giving 30 points!

olga55 [171]

Answer:

1225

Step-by-step explanation:

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2 years ago

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90 juniors took different SAT-II tests. 40% more students took the Chemistry test than took the History test, and 50% more stude

erastovalidia [21]

Answer:

Step-by-step explanation:

4.5x=90

x=20 history

28 chemistry

42 math

They add to 90.

History test=x

Chemistry test=1.4x

Math test=(1.5)(1.4)=2.1x

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3 years ago

What is the amount of down payment on the house that cost $65,250?

Zarrin [17]

Depends on how much percent you have to put down for the house. Like if it’s 10% then just subtract 10% from the cost of the house.

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3 years ago

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Julia knows that 65×4,903=318,695. Use this understanding to help Julia solve 6.5×4903

slamgirl [31]

Answer:

31869.5

Step-by-step explanation:

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2 years ago