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Kay [80]
3 years ago
11

On Monday, ALL the Grade 7 students either bought their lunch at the canteen or brought their lunch from home. Given that 20% of

the students bought their lunch at the canteen and 116 students brought lunch from home, how many students are in Grade 7?
Mathematics
1 answer:
fenix001 [56]3 years ago
7 0

Answer:

145

.8x = 116 (80% of class is 116)

x=145

Step-by-step explanation:

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shasta claimed that the equation x^2+25=0 can be solved by using its factored form of (x+5i)^2=0, and that -5i is the only zero
Elanso [62]

Answer:

The given equation will have two roots as +5i and -5i

Step-by-step explanation:

Shasta claimed that the equation x^2+25=0 can be solved by using its factored form of (x+5i)^2=0, and that -5i is the only zero for this function

The given equation is x^2+25 =0

This clearly shows it will have complex roots, and since it is a quadratic equation it will have 2 complex roots

x^2 = -25 \\x = \sqrt{-25} \\x= \sqrt{-1}* \sqrt{25}\\

x = i\sqrt{25}

x = ± 5i

It will be false to say that -5i will be the only complex root to this equation.

The given equation will have +5i and -5i as its roots.

Lets verify

x = +5i

(5i)^2 + 25 \\25i^2 + 25 \\25(-1) + 25\\-25 + 25 = 0

x = -5i

(-5i)^2 + 25 \\25i^2 + 25 \\25(-1) + 25 \\-25 + 25 \\ = 0

3 0
3 years ago
The spinner is divided into eight equal sections marked with eight different colors what situation could be represented by the s
meriva
I believe the answer you looking for is Probability.

This means that if someone spinned that wheel, they have a probability of getting the color they need.

For instance,
Let's say this wheel had the colors red, orange, yellow, green, blue, indigo, purple, and pink.
If I wanted the color red on the spinner, I have a 1/8 chance to spin the color red. I have a 7/8 chance of NOT spinning red. However, let's say the wheel had 4 colors that were pink and 4 colors that were blue. If I wanted to spin the color pink, I would have a 4/8 chance OF spinning it and a 4/8 chance of NOT spinning it. 4/8 is also equivilant to 1/2.

I hope this helps you understand!!
Please mark brainliest!!
Thanks!!
8 0
3 years ago
How do you do _+-5=-13
GalinKa [24]
First make the dash an x. Then move over to the other side of the = so it looks like this:
-5=-13-x
You take -13 to the other side of the equal sign so it looks like this:
-5+13=-x
Then:
8=-x or x=-8
Hopefully that makes sense.
5 0
4 years ago
Read 2 more answers
Prove that 3:8 is equivalent to 12:32 use diagrams to support your answer. Use the description of equivalent ratios to support y
baherus [9]
12 divided by 3 = 4

therefore both sides must be multiplied by 4

3*4 = 12
8*4 = 32

(brainliest would be appreciated)
5 0
4 years ago
Find the slope of the lines joining each of the following pair of points.<br> (3,-2) and (4,7)
madreJ [45]

Answer:

9/7 or 1 2/7

Step-by-step explanation:

use the formula rise/run

7 0
3 years ago
Read 2 more answers
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