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3 years ago

15

Factorise fully 9x^2 - 16y^2

1 answer:

dsp733 years ago

4 0

Note: a² - b² = (a-b)(a+b)

9x² - 16y² = (3x)² - (4y)² = (3x - 4y)(3x + 4y)

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The boxplot displays the scores from an economics chapter test. identify the second quartile.

netineya [11]

Answer:

Step-by-step explanation:

The middle line is the median, then from left to right the lines are the first, second, third and fourth quartile.

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3 years ago

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What is thirty percent of two hundred ?

shtirl [24]

The answer is 60. Because if u do 30% x by 200 but u need to get rid of the percent which means u divide it by 100 to get rid of a percent and multiply by a hundred to get a percentage. So it would be 30 x 200 divided by 100.

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The waiting time, in hours, between successive speeders spotted by a radar unit is a continuous ran- dom variable with a cumulat

enyata [817]

Answer: 0.5507

Step-by-step explanation:

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Since , the waiting time is in hours , then we can write 12 minutes as $\dfrac{12}{60}$ hour i.e.0.2 hour.

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$P(X$

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3 years ago

What is the area of a triangle with vertices at (0, −2) , (8, −2) , and (9, 1) ?

Oxana [17]

Check the picture below.

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3 years ago

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. Use the grid on the right.

timofeeve [1]

Answer with Step-by-step explanation:

We are given that

O(0,0),P(3,-1) and Q(2,3) on the coordinate plane.

Mark point O(0,0), P(3,-1) and Q(2,3) on the graph and then join OP,PQ and OQ.

b.We have to find OP and OQ are perpendicular or not.

Slope-formula: $m=\frac{y_2-y_1}{x_2-x_1}$

By using the formula

Slope of OP= $\frac{-1-0}{3-0}=-\frac{1}{3}$

Slope of OQ= $\frac{3-0}{2-0}=\frac{3}{2}$

When two lines are perpendicular then

Slope of one line= $-\frac{1}{slope\;of\;other\;line}$

Slope of line OP $\neq -\frac{1}{slope\;of\;line\;OQ}$

Hence, line OP and OQ are not perpendicular.

3 0

3 years ago