Explain how finding 4 times 384 can help you find 4 times 5,384

Mathematics

1 answer:

Lubov Fominskaja [6]3 years ago

8 0

5384=5000+384

4 * 5384 = 4(5000+384) = 4 * 5000 + 4 * 384

4 * 5000 = 20000

20000 + 4 * 384

So to find 5384 * 4, you add 20000 to 4*384. Less calculations

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How do you Evaluate?

slavikrds [6]

How do you evaluate: To evaluate an algebraic expression, you have to substitute a number for each variable and perform the arithmetic operations. In the example above, the variable x is equal to 6 since 6 + 6 = 12. If we know the value of our variables, we can replace the variables with their values and then evaluate the expression.

3 0

3 years ago

Simplify this algebraic expression. 9k + 7 - K + 4 =

Maksim231197 [3]

Answer:

8k+11

Step-by-step explanation:

Combine like terms

9k-k

7+4

9k-k=8k

7+4=11

8k+11

6 0

3 years ago

The graph of y= - 1/2x+2 is positive over the interval (4, infinity) and negative over the interval (-infinity, 4) .What happens

vichka [17]

The graph of y=ax+b, where a≠0, is always a line:

i) increasing if a>0
ii) decreasing if a<0

Consider the decreasing case.

The line is above the x-axis, that is positive but decreasing. At 1 single point it cuts the x-axis, so x=0, and then it continues decreasing below the x-axis.

Back to our problem:

The graph of y=-1/2 x +2 is a decreasing line.,

so it CANNOT be
"positive over the interval (4, infinity) and negative over the interval (-infinity, 4)"

it is

"negative over the interval (4, infinity) and positive over the interval (-infinity, 4)"

the graph is "positive over the interval (-infinity, 4)", it means that the line is decreasing but above the x-axis until 4, (4 not included).

then, "negative over the interval (4, infinity)", which means that the line is now decreasing below the x-axis.

when x=4, the line cuts the x-axis.

check the graph of the line generated using desmos.com