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Viefleur [7K]
3 years ago
14

Explain how 9 x 4 can help you find 9 x 8

Mathematics
2 answers:
MrMuchimi3 years ago
3 0
You can double the product of 9 and 4 to get to the product of 9 and 8
snow_tiger [21]3 years ago
3 0
You get the answer for 9✖️4 which is 36 and then you double that and you get the answer for 9✖️8 which is 72
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Ten times the sum of half a number and 6 is 8
Kisachek [45]
10* (n/2+6) =8 
Solve for n to get your answer
7 0
3 years ago
Is anyone good at math and can help with this, or at least the first one and explain how to do it?​
Anna007 [38]

now, bear in mind that all these ones are lines, and to graph a line all you need is two points, so let's pick a couple of random values for say "x" and let's see what we get for "y" and that's our x,y point.

3)

9x+4y=-16\implies \stackrel{\textit{using x = 0}~\hfill }{9(0)+4y=-16}\implies 4y=-16 \\\\\\ y=\cfrac{-16}{4}\implies y=-4~\hspace{10em}(0~~,~~-4) \\\\[-0.35em] ~\dotfill\\\\ 9x+4y=-16\implies \stackrel{\textit{using x = -4}~\hfill }{9(-4)+4y=-16}\implies -36+4y=-16 \\\\\\ 4y=20\implies y = \cfrac{20}{4}\implies y = 5~\hspace{10em}(-4~~,~~5)

check the red line in the picture below.

4)

5x+2y=8\implies \stackrel{\textit{using x = 0}~\hfill }{5(0)+2y=8}\implies 2y=8\implies y=\cfrac{8}{2}\implies y=4 \\\\\\ ~\hspace{10em}~\hspace{10em}(0~~,~~4) \\\\\\ 5x+2y=8\implies \stackrel{\textit{using x = 4}~\hfill }{5(4)+2y=8}\implies 20+2y=8\implies 2y=-12 \\\\\\ y=\cfrac{-12}{2}\implies y=-6~\hspace{10em}(4~~,~~-6)

check the blue line in the picture below.

8 0
3 years ago
Seven more than the product of a number and 5 equals 2 . Use the variable c for the unknown number.
svetoff [14.1K]

Answer:

Equation: 5c + 7 = 2

Solution: The number is -1.

Step-by-step explanation:

The unknown number is c.

"the product of a number and 5" is 5c

"Seven more than the product of a number and 5" is 5c + 7

"Seven more than the product of a number and 5 equals 2" is 5c + 7 = 2

The equation is

5c + 7 = 2

To solve, we first subtract 5 from both sides.

5c + 7 - 7 = 2 - 7

5c = -5

Now divide both sides by 5.

5c/5 = -5/5

c = -1

Answer: The number is -1.

7 0
4 years ago
How do I find the coordinate of the midpoint of a segment ... -6--2
kirill115 [55]
I'm having the same troubles with this type of geometry sort of.
6 0
4 years ago
I want to know the formula of logarithm
Luden [163]

Answer:

\log_{b}({b^x})=x

Step-by-step explanation:

hope this helps

8 0
2 years ago
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