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3 years ago

The height of a sunflower increases from 82 cm to 1 metre in a week. Find the percentage increase in height.

1 answer:

7 0

So, the sunflower is increasing from .82 meters to 1 meter. This is a .18 meter increase. We need to figure out what percent of 82 18 is. We do this by dividing 18 by 82 and multiply the result by 100 to get a percent. This equals 21.95%

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Worth 25 points, giving brainiest to a quick and good answer.

vredina [299]

Answer:

Step-by-step explanation:

Note that the quadratic formula has that "plus or minus" due to our taking the square root of some quantity. No square root is involved in the two formulas you've posed.

I have two suggestions here:

1) Write " (x plus or minus y)^2 = x^ plus or minus 2 times xy + y^2 " Note that a + on the left side corresponds to a + on the right side, and same with - .

2) Memorize these two formulas, which in most algebra textbooks you'll find in the section "special products and factoring."

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3 years ago

If the coordinate of A is (0,-2) and the coordinate of B is (10,-6), then the midpoint of AB is (______).

balu736 [363]

Answer:

5, -4

Step-by-step explanation:

midpoint = x1 + x2/2 ,y1 + y2/2

= 0 + 10 /2 , -2 + -6/2

= 10/2 , -8/2

midpoint = 5, -4

4 0

3 years ago

X^-2+4x^-1+3=0 solve by making appropriate substitution

Alex

ANSWER

$x = - 1 \: or \: x = - \frac{1}{ 3}$

EXPLANATION

The given equation is:

${x}^{ - 2} + 4 {x}^{ - 1} + 3 = 0$

Recall that:

${a}^{ - m} = \frac{1}{ {a}^{m} }$

$\frac{1}{ {x}^{2} } + \frac{4}{x} + 3 = 0$

${( \frac{1}{x} )}^{2} + 4( \frac{1}{x} ) + 3 = 0$

Let

$u = \frac{1}{x}$

Our equation then becomes:

${u}^{2} + 4u + 3 = 0$

The factors of 3 that add up to 4 are:

${u}^{2} + 3u + u + 3$

$u(u + 3) + 1(u + 3) = 0$

$(u + 1)(u + 3) = 0$

$u + 1 = 0 \: or \: u + 3 = 0$

$u = - 1 \: or \: u = - 3$

This implies that:

$\frac{1}{x} = - 1 \: or \: \frac{1}{x} = - 3$

$x = - 1 \: or \: x = - \frac{1}{ 3}$

7 0

3 years ago

The GCF of 36 and 63 is

Vitek1552 [10]

Answer:

Step-by-step explanation:

7 0

4 years ago

Read 2 more answers

A handyman and his helper worked on the same job. The ratio of the handyman’s page to the helpers pay was 7 to3. If the total fe

Ganezh [65]

You would first add the two parts of the ratio to get ten, then divide 120 by ten to get 12. This means that each part of the ratio is worth 12 dollars, so to get the helper’s salary you would multiply 12 by three to get a total of 36.

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4 years ago