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3 years ago

Which equation is equivalent to x + 8 = 21? (x + 8) × 4 = 21 (x + 8) × 4 = 21 ÷ 4 (x + 8) × 4 = 21 × 2 (x + 8) × 4 = 21 × 4

Mathematics

1 answer:

Drupady [299]3 years ago

7 0

Answer:

(x + 8) × 4 = 21 × 4

Explanation:

x + 8 = 21

21 - 8 = 13

(13 + 8) × 4 = 21 × 4

21 × 4 = 21 × 4

84 = 21 × 4

84 = 84

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Joe had $100. He bought m books for n dollars each. How much money does he have left?

Gwar [14]

Answer:

100-mn

Step-by-step explanation:

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3 years ago

Solve for c. -c/2+43 = 50

noname [10]

$\huge\text{Hey there!}$

$\mathsf{-\dfrac{c}{2}+43=50}$

$\large\text{SUBTRACT 43 to BOTH SIDES}$

$\mathsf{-\dfrac{c}{2}+43-43=50-43}$

$\large\textsf{CANCEL out: 43 - 43 because that gives you 0}$

$\large\textsf{KEEP: 50 - 43 because it helps solve for the c-value}$

$\mathsf{50 - 43 = \bf 7}$

$\large\text{NEW EQUATION: }\mathsf{-\dfrac{c}{2}=7}$

$\large\textsf{MULTIPLY }\mathsf{\dfrac{2}{-1}}\large\textsf{ to BOTH SIDES}$

$\mathsf{\dfrac{2}{-1}\times-\dfrac{c}{2}= \dfrac{2}{-1}\times7}$

$\large\textsf{CANCEL out: your RIGHT SIDE of the equation because that gives}\\\large\textsf{you 1}$

$\large\textsf{KEEP: }\mathsf{\dfrac{2}{-1}\times7}\large\textsf{ because that helps solve for the c-value}$

$\uparrow\large\text{SIMPLIFY THE EQUATION ABOVE \& YOU HAVE YOUR}\\\large\text{C-VALUE}\uparrow$

$\boxed{\boxed{\large\text{ANSWER: \huge\bf c = -14}}}\huge\checkmark$

$\large\text{Good luck on your assignment and enjoy your day!}$

~ $\frak{Amphitrite1040:)}$

5 0

3 years ago

M = 3, through (1,-1) Point-Slope Slope intercept

Lapatulllka [165]

Answer:

$\large\boxed{y+1=3(x-1)}\\\\\boxed{y=3x-4}$

Step-by-step explanation:

The point-slope form of an equation of a line:

$y-y_1=m(x-x_1)$

m - slope

(x₁, y₁) - a point on a line

We have

$m=3,\ (1,\ -1)\to x_1=1,\ y_1=-1$

Substitute:

$y-(-1)=3(x-1)\\\\\boxed{y+1=3(x-1)}$

Convert to the slope-intercept form

$y=mx+b$

m - slope

b - y-intercept

$y+1=3(x-1)$ use the distributive property

$y+1=3x-3$ subtract 1 from both sides

$\boxed{y=3x-4}$

3 0

3 years ago

The correlation coefficient for blood pressure and amount of vegetables eaten in a group of people is −0.7. Analyze the followin

Alinara [238K]

No it's not a reasonable conclusion. Correlation does not lead to causation. If two variables are linked, then they may affect one another or there may be another set of factors involved. There isn't enough info to know for sure. The fact that r = -0.7 is fairly close to r = -1 indicates there's moderately strong negative correlation, but I don't think it's strong enough in my opinion. More research is needed.

In short, the keyword "caused" as part of the claim is what makes it unreasonable. There is no way to know that not eating vegetables leads to high blood pressure. It may be true but again, more info is needed.

5 0

4 years ago

Read 2 more answers

Someone help me please

wolverine [178]

Answer: Blue is longer

Step-by-step explanation: Blue islonger because it strtches a

corss more than 3 it almost reaches 4 ( no it is 4 dots long )

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3 years ago