What is 21 to the 2nd power

Mathematics

1 answer:

Mnenie [13.5K]4 years ago

3 0

21×21=441

Answer: 441

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Solve the compound inequality 4x – 7 > 5 or 5x + 4 ≤ –6

bija089 [108]

Answer:

inequality form: x $\leq$ -2 or x > 3

interval notation form: (-∞,-2] ∪ (3,∞)

Step-by-step explanation:

I attached a picture that shows all the work. You begin by isolating then solving for x on both sides. Then form a solution using the information found out about x. For example, you can combine the found inequalities for x to solve that x must be GREATER than 3 while being LESS than -2. Using that you can form an line and make a line. Remember, when writing in interval notation form you always begin from the left to the right (in reference) to the number line.

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2 years ago

A Ferrari is heading south at a constant speed on Broadway (a north/south street) at the same time a Mercedes is heading west on

Studentka2010 [4]

Answer:

49.92 miles/hour

Step-by-step explanation:

32 miles/hour = 32 * 5280 = 168960 ft/hour

For the collision to occur, both cars must arrive at the intersection at the same time.

The time it takes for the Mercedes to travel 400 feet at the rate of 168960 ft/hour is 400 / 168960 = 0.002367 hours

So the Ferrari should take the same time to travel 624 feet as well, its speed would be

624 / 0.002367 = 263577.6 ft/hour or 263577.6 / 5280 = 49.92 miles/hour

5 0

3 years ago

[HELP FAST] A line passes through the point (4, -9) and has a slope of -5/4

DENIUS [597]

Answer:

$y= \frac{-5}{4}x -4$

Step-by-step explanation:

using pt-slope form, we get $y - (-9) = \frac{-5}{4}(x-4)$ . Using the Distributive Property and Addition Propert of Equality, we can simplify this equation into $y = \frac{-5}{4}x + 5$ by factoring -5/4 into (x-4) and subtracting 9 from both sides.