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3 years ago

NEED HELP Solve: 3x + (2 - 4x); when x = 5 *

Mathematics

2 answers:

Inga [223]3 years ago

7 0

Answer:

-3

Step-by-step explanation:

3x5=15

+1(2-4x5)=2-20-18

15-18=-3

kvasek [131]3 years ago

7 0

Answer:

-3

Step-by-step explanation:

Given equation for reference: 3x + (2 - 4x)

3(5) + (2 - 4(5)) is with x substituted for 5.

Next, we just follow PEMDAS like any other expression

First off, parentheses.

2 - 4(5), starting with multiplication, and then subtraction

The result of the parentheses is -18

3(5) - 18 is the result when we put that back into the expression.

Next, we multiply 3 by 5; the result being

15 - 18

Now, we just subtract 18 from fifteen, getting -3

Hope this helps!

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How to I find a? It’s round to the nearest tenth.

Irina18 [472]

Answer:

a ≈ 21.8

Step-by-step explanation:

We require the third angle in the triangle

Subtract the sum of the 2 angles from 180

third angle = 180° - (75 + 31.8)° = 180° - 106.8° = 73.2°

Using the Sine rule, that is

$\frac{a}{sin73.2}$ = $\frac{22}{sin75}$ ( cross- multiply )

a × sin75° = 22 × sin73.2° ( divide both sides by sin75° )

a = $\frac{22sin73.2}{sin75}$ ≈ 21.8 ( to the nearest tenth )

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3 years ago

Which out of these numbers has the same absolute value as one another and please help I don't really understand absolute value

Mariulka [41]

Answer:

Step-by-step explanation:Absolute value is a number's distance away from zero. For example, on a number line, -9 is 9 spaces away from zero. So, the absolut value is 9. Similarly, the number 9 is also 9 spaces from zero, so the absolute value would be 9. 9 and -9 both have an absolute value of 9. I hope this is helpful!

8 0

3 years ago

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If the measure of an angle is 78 less than the measure of its compliment, what is the measure of the angle?

aliina [53]

Complementary angles add up to 90'
So let X= angle 1
Y=angle 2
So x+y=90
let x=y-78
so(y-78)+y=90
y-78+y=90
2y-78=90
2y=90+78
2y=168
y=168/2
y=84
x=y-78
so x=84-78
x=6
And 6+84=90
So the measure of the angle is 6 degrees.
Hope i helped!

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3 years ago

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If you could help I would really appreciate it, but if not that’s fine. Thank you.

Kobotan [32]

Since 7 is greater than 5, you input it into the last equation.

2•(7) -7
14-7
7

The answer is 7!

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2 years ago

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Vadim26 [7]

Answer:

Her answer is wrong because she the object cannot hit the ground at negative seconds. She could’ve have used other methods because she used the quadratic formula. The advantages is that it works for every situation. The disadvantages is that it takes longer. She should’ve used a different method.

Step-by-step explanation:

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3 years ago

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