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katrin [286]
3 years ago
7

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

Mathematics
1 answer:
kherson [118]3 years ago
7 0
You would substitute 0.8 in for y and to get the equation 4x+8(0.8)=40. Then, you would simplify and get 4x+6.4=40. Next you would isolate x by subtracting 6.4 from both sides and get the equation 4x=33.6 and then you would divide both sides by 4 to get x=8.4.

The answer is : x=8.4

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(8 x 3) + (8 x 2) = 8 x (blank + blank)
kakasveta [241]

Step-by-step explanation:

(8 x 3) + (8 x 2) = 8 x (3 + 2)

24 + 16 = 8 * 5

40 = 40

Hope it will help :)❤

8 0
3 years ago
Convert -3pi/10 to degrees
ipn [44]

we know there are 180° in π radians, how many degrees then in -3π/10 radians?

\bf \begin{array}{ccll} degrees&radians\\ \cline{1-2} 180&\pi \\\\ x&-\frac{3\pi }{10} \end{array}\implies \cfrac{180}{x}=\cfrac{\pi }{~~-\frac{3\pi }{10}~~}\implies \cfrac{180}{x}=\cfrac{\frac{\pi}{1} }{~~-\frac{3\pi }{10}~~} \\\\\\ \cfrac{180}{x}=\cfrac{\pi }{1}\cdot \cfrac{10}{-3\pi }\implies \cfrac{180}{x}=-\cfrac{10}{3}\implies 540=-10x\implies \cfrac{540}{-10}=x \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill -54=x~\hfill

5 0
4 years ago
Which equation represents a line which is perpendicular to the line y=5/4x-7
son4ous [18]
Y = -4/5x-7.

Step by Step Explanation:

To find perpendicular functions, you have to flip the slope.
5 0
3 years ago
Find the value of the expression (3x−12)−(12xy−10)(3x-12)-(12xy-10) for x=3x=3 and y=6y=6
Rina8888 [55]
Hi!

Put in the values for x and y.

(3 · 3 - 12)-(12 · 3 · 6 - 10)

Solve

(9 - 12)-(216 - 10)
-3 - 206
-209

The answer is -209

Hope this helps! :)

4 0
3 years ago
Read 2 more answers
What does the expression 5 minus n represent? (Please I need help bad.) 1.) some number more than five 2.) five more than some n
Lelechka [254]

Answer:

4) five less than some number

Step-by-step explanation:

In subtraction the number that is first matters and subtraction phrase is less than, so you can conclude that it's 4) five less than some number.

5 0
3 years ago
Read 2 more answers
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