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Phoenix [80]
3 years ago
7

A test has 20 questions how many do you need to answer correctly in order to get 4/5 of them right

Mathematics
2 answers:
Ket [755]3 years ago
7 0

4/5 x 20 = 16


Answer: 16 questions

lora16 [44]3 years ago
5 0

To figure out the question, we can do 20 multiplied by 4/5, aka 0.8, and we get 16 questions as our answer!

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A right cylinder has a radius of 5 and a height of 9. What is its surface area?​
harkovskaia [24]

Answer:

B. 140π units²

Step-by-step explanation:

Surface area of a cylinder:

2πrh + 2πr²

2π(5)(9) + 2π(5²)

90π + 50π

140π

5 0
2 years ago
Plz help I need help
fenix001 [56]

Answer:

3 / 4 * 50 = 150 / 4

= 37.5 or 37½ yards

Step-by-step explanation:

5 0
3 years ago
A parabola with the vertex at (1.5, 12.5) inscribes a segment of length 5 on x-axis. What is the area of the triangle formed by
damaskus [11]

Answer:

  20 units²

Step-by-step explanation:

The x-intercepts are symmetrically located around the x-coordinate of the vertex, so are at

  1.5 ± 5/2 = {-1, 4}

Using one of these we can find the unknown parameter "a" in the parabola's equation (in vertex form) ...

  0 = a(4 -1.5)² +12.5

  0 = 6.25a +12.5 . . . . . simplify

  0 = a +2 . . . . . . . . . . . divide by 6.25

  -2 = a

Then the standard-form equation of the parabola is ...

  y = -2(x -1.5)² +12.5 = -2(x² -3x +2.25) +12.5

  y = -2x² +6x +8

This tells us the y-intercept is 8. Then the relevant triangle has a base of 5 units and a height of 8. Its area is given by the formula ...

  A = (1/2)bh = (1/2)(5)(8) = 20 . . . . units²

5 0
3 years ago
There are 15 male teachers in the school. There are 35 female teachers in the school. <br><br>​
Alex777 [14]

Answer:

the ratio of make to female teachers is 3:7

4 0
3 years ago
45 =p x 60 <br> NEED HELP ASAP
Alexus [3.1K]

Answer:

p = 3/4 or 0.75

Step-by-step explanation:

your equation: 60p = 45

divide both sides by 60: p = 45/60

simply the fraction by dividing the numerator and denominator by 15: p = 3/4

your answer: 3/4 or 0.75

8 0
3 years ago
Read 2 more answers
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