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DerKrebs [107]
3 years ago
9

I don’t understand these type of questions

Mathematics
1 answer:
storchak [24]3 years ago
6 0

Answer:

5=135

7=45

Step-by-step explanation:

Set them equal to 180. So i started plugging in numbers and subtracting them by 90. Then add it back to the number until i got 180.

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14d + 21 and<br> 7(2d + 3)
Gennadij [26K]

Answer:

the answer is 28d + 42

Step-by-step explanation:

multiply what's on the brackets them add

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3 years ago
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The answer and explanation is in the image.

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2 years ago
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1. Thom has a scale model of his car. The
MariettaO [177]

x =\frac{4}{3}inch is the size in wheels on the scale model .

<u>Step-by-step explanation:</u>

Correct Question : Tom has a scale model of his car. The scale factor is 1 : 12. If the actual car has 16-inch wheels, what size are the wheels on the scale model?

We have , The scale factor is 1 : 12. We need to find If the actual car has 16-inch wheels, what size are the wheels on the scale model .Let's find out:

Ratio of size of wheels to actual size of wheels is 1:12 , but actual car has 16-inch wheels So ,

⇒ \frac{1}{12}  = \frac{x}{16}                 { x is size of wheel in scale model }

⇒ \frac{1(16)}{12}  = \frac{x}{16}(16)

⇒ x =\frac{16}{12}

⇒ x =\frac{4}{3}inch

Therefore , x =\frac{4}{3}inch is the size in wheels on the scale model .

5 0
3 years ago
I need help with this problem x²+4x﹣30=﹣3x
a_sh-v [17]

Answer:

x^2 + 4x -30 = -3x\\x^2 + 4x +3x -30 = 0\\x^2 + 7x -30 = 0\\x^2 +10x -3x -30 = 0\\x(x+10) -3(x+10)\\(x-3)(x+10) = 0\\x = 3, -10

7 0
2 years ago
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What is the value of -16 divided by 2.5
tamaranim1 [39]
Hey the answer to your question is -6.4
8 0
2 years ago
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