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irga5000 [103]
3 years ago
10

Which method can't you use to solve x²+7x=0.

Mathematics
1 answer:
scoray [572]3 years ago
6 0

Answer:

Factoring

Step-by-step explanation:

x^2 + 7x = x(x + 7) = 0

So

x = 0 or x = -7

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An ant population starts at 1200 for a certain colony. As each month goes by in the winter, 6.5% of the population dies off. How
Nitella [24]

Answer:

There will be 916 ants alive after 4 months.

Step-by-step explanation:

Step 1

Let's change the percentage to a decimal by dividing by a 100.

6.5% / 100 = .065

Step 2

So, for the first month we will multiply the initial amount of ants by .065 and this will give us the number of ants that die.

1200 * .065 = 78

This means that after the first month, 1200 - 78 = 1122 ants will be alive.

Step 3

Now for the second month: 1122 * .065 = 72.93 (rounded to 73)

1122 - 73 = 1049 ants will be alive

Step 4

For the third month 1049 * .065 = 68.185 (rounded to 68)

1049 - 68 = 981 ants will be alive

Step 5

For the fourth month 981 * .065 = 63.765 (rounded to 64)

981 - 64 = 916 ants will be alive

Hope this helps!

5 0
3 years ago
Read 2 more answers
23 yd
stealth61 [152]
72.22 I think I’m sorry if I’m wrong
4 0
3 years ago
Read 2 more answers
Find the lateral surface area of the cylinder. Round your answer to the nearest tenth.
Svet_ta [14]

Answer:

A=2πrh

Step-by-step explanation:

A=2*22/7*4*9

=230

5 0
3 years ago
Finley’s pumpkin had a mass of 6.5 kilograms before he carved it. After carving it the pumpkin had a mass of 3.9 kilograms. What
katen-ka-za [31]
Hello.

The percent decrease in the mass of the pumpkin for this case will be given by:
 (100 - (3.9 / 6.5) * 100) =
 (100-60) =40%


 After carving it, the pumpkin decreases a percent of 40% in the mass.

Have a nice day
4 0
3 years ago
Read 2 more answers
Find sin, where the angle is shown<br> Give the exact value, not a decimal approximation
olga_2 [115]

Answer:

sinΘ = \frac{24}{25}

Step-by-step explanation:

sinΘ = \frac{opposite}{hypotenuse}

The opposite is 24, but we require the hypotenuse h

Using Pythagoras' identity

h² = 7² + 24² = 49 + 576 = 625 ( take square root of both sides )

h = \sqrt{625} = 25

Thus

sinΘ = \frac{24}{25}

6 0
3 years ago
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