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3 years ago

Please help I’m really bad at math.:(

Mathematics

1 answer:

kirill [66]3 years ago

5 0

Answer:

The following solution is incorrect. The correct value of x is 7.

Step-by-step explanation:

$3(4x - 15) = 39$

Distribute 3 to (4x-15). When distributing, the value outside parentheses is multiplied to all the numbers inside the parentheses. Since the 3 was only multiplied to 4x, the solution is wrong.

$12x - 45 = 39$

Add 45 to both sides.

$12x = 84$

Divide by 12 from both sides.

$x = 7$

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Step-by-step explanation:

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3 years ago

Read 2 more answers

Problem number 7 trigonometry

Natasha_Volkova [10]

7) - 1

tan <BAD = BD / AD

BC = √(64 + 36)
BC = √100
BC = 10

now you can solve BD
BD/6 = 6/10
BD = 6*6 / 10
BD = 36/10
BD = 3.6

AD = √36 - 12.96
AD = √23.04
AD = 4.8

tan <BAD = BD / AD
tan <BAD = 3.6 / 4.8
tan <BAD = 0.75

7) - 2

cos <DAC + cos <DAB

as you know cos = Adj / Hypo

cos <DAC = AD/AC
cos <DAC = 4.8 / 8
cos <DAC = 0.6

cos <DAB = AD / AB
cos <DAB = 4.8/6
cos <DAB = 0.8

so
cos <DAC + cos <DAB = 0.6 + 0.8
cos <DAC + cos <DAB = 1.4

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3 years ago

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Answer:

4. x²+x

Step-by-step explanation:

the product of x(x + 1) = (x)(x) + (x)(1)

= x²+x

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