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CaHeK987 [17]
2 years ago
9

28 first graders and 12 other students attended a school assembly what percentage of the students at the assembly were first gra

ders​
Mathematics
2 answers:
Hitman42 [59]2 years ago
8 0

Answer:

70%

Step-by-step explanation:

28+12= 40

28/40= 0.7

0.7x100= 70

Harlamova29_29 [7]2 years ago
3 0

Answer:

70%

Step-by-step explanation:

Find the total students who attended a school assembly:

28 + 12 = 40

100% = 40 students

1% = 40 ÷ 100 = 0.40

28 ÷ 0.40 = 70

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You use the quadratic formula:

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2x {}^{2} - 3x - 5 = 0

x = \frac{3 + - \sqrt{9 -4(2)( - 5)}}{2 \times 2}  

x = \frac{3 + - \sqrt{49} }{4}  

x = \frac{3 + 7}{4} \: and \: x = \frac{3 - 7}{4}  

x = \frac{5}{2} \: and \: x = - 1

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Answer: Hello Luv......

Hope this helps. Mark me brianest please... Anna ♥

Step-by-step explanation:

Answer: -40 < T < 140

From the question, we are informed that the gas that the driver uses freezes at −40° F and evaporates at 140° F.

To get the inequality to represent the temperatures at which the gas in the truck will remain in liquid form, we should note that the temperature will be lower than 140°F but more than -40°F. This can be expressed as:

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The ratio of pencils to erasers is 4:1. If there are 20 pencils, how many erasers are there.
Leokris [45]

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Reil [10]

<u>Answer:</u>

9. x = 12

10. x = 31

<u>Step-by-step explanation:</u>

9. Corresponding angles are equal, so technically you can move that (7x - 20) to be diagonal with the (4x + 16). Along with the corresponding angle, diagonal angles are equal to each other. Therefore you can set (7x - 20) equal to (4x + 16) to find x.

7x - 20 = 4x + 16

Solve

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Therefore x is equal to 12

<u>Check:</u>

4(12) + 16

= 64

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= 64

10. All angles in a triangle have to add up to 180 degrees. Therefore, you can write your equation like this:

x + 2x + 25 + 2x = 180

Combine like terms

5x + 25 = 180

Solve

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Therefore, x = 31.

<u>Check:</u>

31 + 2(31) + 25 + 2(31) = 180

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<em>I hope this helps!!</em>

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