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denis23 [38]
3 years ago
9

What is the value of x in the equation 4x + 8y =40, when y=0.8

Mathematics
1 answer:
Naily [24]3 years ago
3 0

Answer:

x= 8.4

Step-by-step explanation:

y=0.8

4x + 8y =40

4x + ( 8 x 0.8) = 40

4x + (6.4)  =40

4x = 40 - 6.4

4x = 33.6

x = 8.4

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The quadratic function d = –2x^2 + 15 models a skateboarder’s distance, in feet, from the bottom of a hill x seconds after the s
Ksenya-84 [330]

Answer:

After 1.87 seconds the skateboarder is 8 ft from the bottom of the hill.

Step-by-step explanation:

The quadratic function d = –2*x² + 15 models a skateboarder’s distance, in feet, from the bottom of a hill x seconds after the skateboarder starts moving down the hill.

You want to know after how many seconds the skater is 8 feet from the bottom of the hill. That is, with the distance being 8 feet, you want to calculate the time t. Replacing in the expression d by the value of 8 feet:

8=–2*x² + 15

Solving:

8-15 = -2*x²

-7= -2*x²

(-7)÷(-2)= x²

3.5= x²

√3.5=x

1.87= x

<u><em>After 1.87 seconds the skateboarder is 8 ft from the bottom of the hill.</em></u>

5 0
3 years ago
Jim can read 17 pages in 12 minutes. If he can maintain this pace, how many pages can he read in one hour?
Lostsunrise [7]
Answer: 85 pages
cross multiply 60 x 17 = 1020 / 12 = 85

17 85
— = —
12 60
7 0
3 years ago
Which of the following rational numbers is equal to 3.5 with a bar over it.
vagabundo [1.1K]
D-32/9
32 + 9 = 3.5555555555556
3 0
3 years ago
<img src="https://tex.z-dn.net/?f=3.96x0.25%20-%20%20%5Csqrt%7B0.0256%20%7D%20" id="TexFormula1" title="3.96x0.25 - \sqrt{0.025
kari74 [83]
The correct answer for this problem is 0.83.
4 0
4 years ago
What is the answer to 7y-4.5-6y
Archy [21]

Answer:

y=3.5

Step-by-step explanation:

<u>7</u><u>y</u><u>-</u><u>4</u><u>.</u><u>6</u><u>-</u><u>6</u><u>y</u>

<u>4</u><u>.</u><u>5</u><u>=</u><u>7</u><u>y</u><u>+</u><u>6</u><u>y</u>

<u>4</u><u>.</u><u>5</u><u>=</u><u>1</u><u>3</u>y

4.5. 4.5

y=3.5

3 0
3 years ago
Read 2 more answers
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