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blondinia [14]
2 years ago
15

Round 8.6 to the nearest whole number​

Mathematics
1 answer:
Pepsi [2]2 years ago
8 0

Answer:

the answer is 9

Step-by-step explanation:

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Find the constant of proportionality k. Then write an equation for the relationship between x and y
ExtremeBDS [4]

Question:

Find the constant of proportionality k. Then write an equation for the relationship between x and y

\begin{array}{ccccc}x & {2} & {4} & {6} & {8} \ \\ y & {10} & {20} & {30} & {40} \ \ \end{array}

Answer:

(a) k = 5

(b) y = 5x

Step-by-step explanation:

Given

\begin{array}{ccccc}x & {2} & {4} & {6} & {8} \ \\ y & {10} & {20} & {30} & {40} \ \ \end{array}

Solving (a): The constant of proportionality:

Pick any two corresponding x and y values

(x_1,y_1) = (2,10)

(x_2,y_2) = (6,30)

The constant of proportionality k is:

k = \frac{y_2 - y_1}{x_2 - x_1}

k = \frac{30-10}{6-2}

k = \frac{20}{4}

k = 5

Solving (b): The equation

In (a), we have:

(x_1,y_1) = (2,10)

k can also be expressed as:

k = \frac{y- y_1}{x- x_1}

Substitute values for x1, y1 and k

5 = \frac{y- 10}{x- 2}

Cross multiply:

y - 10 = 5(x - 2)

Open bracket

y - 10 = 5x - 10

Add 10 to both sides

y - 10 +10= 5x - 10+10

y = 5x

6 0
3 years ago
Divide the difference between 70 and 20 by 25.
pentagon [3]

Answer:

The Answer is 2

Step-by-step explanation:

70 - 20= 50 and if you divide by 25 you get 2. Because 25 times 2 = 50 hope it helps

5 0
3 years ago
Read 2 more answers
How many grams are 7.00 x 1022 molecules of NaOH?
olya-2409 [2.1K]

Answer:

46.5

explanation

6.022*10^23 molecules=40g.

7.00*10^23=40*7.00*10^23/6.022*10^23 g =46.5 g

8 0
3 years ago
6x-8 = -4x+7 solve for x
Fantom [35]

Answer:

so look

Step-by-step explanation:

6x=7+8

2 Simplify  7+87+8  to  1515.

6x=156x=15

3 Divide both sides by 66.

x=\frac{15}{6}x=

​6

​

​15

​​

4 Simplify  \frac{15}{6}

​6

​

​15

​​   to  \frac{5}{2}

​2

​

​5

​​ .

x=\frac{5}{2}x=

​2

​

​5

​​

Done

Decimal Form: 2.5

5 0
3 years ago
Read 2 more answers
Find 1.47 divided by 3.5. Does the answer change if you use a different power of 10 to multiply the dividend and the divisor bef
MrRa [10]
<span>the answer to 1.47 divided by 3.5 is 0.42. When you use different power of 10 to multiply the dividend and the divisor, the answer changes to different multiples of 0.42 in terms of 10. The answer could be 0.042 or 4.2 etc depending on the power of 10 used to multiply the dividend and divisor.</span>
5 0
3 years ago
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