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4 years ago

What number must be added to the expression below to complete the square?

Mathematics

1 answer:

igomit [66]4 years ago

4 0

When Completing the square you take the 'b' term and divide it by 2, then square it.
3/2, (3/2)^2 = 9/4
Letter C

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Which complex number is equivalent to (7-9i)-(-1+3i)?

son4ous [18]

Just like algebra
i lis like x
distribute invisible -1 to second set
-1(-1+3i)=1-3i

now we have
7-9i+1-3i
8-12i

8 0

3 years ago

Can someone help me with number nineteen

garik1379 [7]

Answer: $\frac{15}{52}$ , Less

Step-by-step-explanation:

This year: $\frac{Day 4}{Day 1 + Day 2 + Day 3 + Day 4} = \frac{15}{13+12+12+15} = \frac{15}{52}$

Last year: $\frac{Day 4}{Day 1 + Day 2 + Day 3 + Day 4} = \frac{15}{10+8+10+12} = \frac{12}{40}$ = $\frac{3}{10}$

Compare this year's with last years by converting the fractions to decimals:

This year: $\frac{15}{52}$ = 0.288

Last year: $\frac{3}{10}$ = 0.300

This year (0.288) is less than last year (0.300)

8 0

3 years ago

NEED HELP! What is the first step to solve the equation a=2d/t^2 , where a is acceleration, d is the distance, and t is time. If

kondor19780726 [428]

Plug in a = 2 m/s^2 and d = 10 m, and solve for t (in s):

$a=\dfrac{2d}{t^2}\iff2\dfrac{\rm m}{\mathrm s^2}=\dfrac{2\cdot10\,\mathrm m}{t^2}$

$\implies t^2=\dfrac{20\,\rm m}{2\frac{\rm m}{\mathrm s^2}}=10\,\mathrm s^2$

$\implies t=\sqrt{10}\,\mathrm s$

So the answer is C.

8 0

3 years ago

In to see the 2x+y=20 6x 5y = 12

Andre45 [30]

Answer:

1: x = 10 − $\frac{y}{2}$

y = 20 − 2 x

2: x = $\frac{25}{y}$

y = $\frac{25}{x}$

Step-by-step explanation:

6 0

3 years ago

Solve the equation (x-2)^2/3=9

statuscvo [17]

Answer:

x = 2±3sqrt(3)

Step-by-step explanation:

(x-2)^2/3=9

Multiply each side by 3

(x-2)^2/3 *3=9*3

(x-2)^2=27

Take the square root of each side

sqrt( (x-2)^2)=±sqrt(27)

x-2 = ±3sqrt(3)

Add 2 to each side

x = 2±3sqrt(3)

6 0

3 years ago