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3 years ago

Add 9a+8b-a+b and 10a-9b+6a-1b

Mathematics

2 answers:

Alina [70]3 years ago

8 0

Answer:

8a + 9b and 16a - 10b

Step-by-step explanation:

Arte-miy333 [17]3 years ago

8 0

8a + 9b and 16a - 10b

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Write two inequalities to compare -2 and -18

QveST [7]

Step-by-step explanation:

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3 years ago

Solve the system by the substitution method. X+Y=-3 Y=-4x

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Rewrite 50 as (50 and 0 tenths) decimal form. Type your answer Please help

Reptile [31]

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Step-by-step explanation:

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3 years ago

11. y is directly proportional to x*2 and y = a for a

IgorLugansk [536]

The expression for y in terms of "a" when value of x is doubled is $y_1=4a$

Solution:

Given that,

y is directly proportional to $x^2$

Therefore,

$y \propto x^2$

$y = kx^2$

Where "k" is the constant of proportionality

y = a for particular value of x

Therefore,

$a=kx^2$ --------- eqn 1

We have to find when x is doubled

x is doubled means 2x

Let it be $y_1$

Hence we get,

$y_1=k(2x)^2\\\\y_1=k \times 4x^2$ --------- eqn 2

Substitute value of k from eqn 1, we get

$y_1=\frac{a}{x^2} \times 4x^2\\\\y_1=4a$

Thus expression for y in terms of "a" when value of x is doubled is $y_1=4a$

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3 years ago

Please help me with this question

Tanzania [10]

Answer:

∠BFA = 75º

Step-by-step explanation:

First, let's add the three angle degrees provided.

$30+45+60 = 135$

Then, we subtract 135 from 360º, which is all the angles added together.

360º - 135º = 225

Since ∠BFC is 2xº, then we have to divide 225 by 3.

$\frac{225}{3} = 75$

∠BFC is twice the amount of x, so ∠BFC is 75 * 2 = 150º

xº is 75º

To check our answer, we can add all these angles and if they add up to 360º, we are correct.

30 + 45 + 60 + 75 + 150 = 360º :)

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3 years ago