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Klio2033 [76]
2 years ago
15

Lena took a test with 20 questions. She lost 5 points for each of the 12 questions she got incorrect, however, gained 20 points

for answering all the bonus questions correctly. How many points did Lena lose overall?
Mathematics
1 answer:
Makovka662 [10]2 years ago
6 0

Answer:

17

Step-by-step explanation:

You might be interested in
MZRSK = x + 53, m KST = x + 109,<br> and mZRST = 156º<br><br><br> Find x.
Dahasolnce [82]

Answer:

-3 = x

Step-by-step explanation:

Since we are not given a midpoint, we use the Angle Addition Postulate:

156 = [x + 109] + [x + 53]

156 = 162 + 2x

-162 - 162

_______________

−6 = 2x

___ ___

2 2

−3 = x

[−3 + 53] + [−3 + 109] = 156

50 106

156 = 156 ☑

Therefore, -3 = xis a genuine statement.

I am joyous to assist you anytime.

4 0
3 years ago
Fractions order from least to greatest<br> Which is the right answer? Pls help ill give brainliest!!
olya-2409 [2.1K]

Answer:

2/5, 4/7, 5/2

Step-by-step explanation:

5/2=2.5     2/5=.40    4/7= .59 that's aproximately  for 4/7

8 0
2 years ago
The perimeter of a rectangular is 58 cm. The length is 5 more than twice the width.
riadik2000 [5.3K]
<h3>Answer:</h3>

a) l = 5 + 2w

b) P = 2(l +w) = 2(5 +2w +w)

c) w = 8 cm, l = 21 cm

<h3>Explanation:</h3>

a) Using w for width, twice the width is 2w, and 5 more than that is 5+2w. This is your expression for l:

... l = 5 + 2w

b) The perimeter is the sum of the lengths of all sides, so is the sum of twice the length and twice the width.

... P = 2(l +w) = 2(5 +2w + w) . . . . substituting for l using the expression of (a)

c) Substituting the given perimeter, we have ...

... 58 = 2(5 +3w) = 10 + 6w . . . . . collect terms, eliminate parentheses

... 48 = 6w . . . . . . . . . . . . . . . . . . subtract 10

... 8 = w . . . . . . . . divide by 6

... l = 5 + 2·8 = 21 . . . . . find length using the formula for it

Dimensions are in centimeters, so we can write the solution as ...

  • width = 8 cm
  • length = 21 cm
6 0
3 years ago
The force of the wind blowing on a vertical surface varies jointly as the area of the surface and the square of the velocity. If
Ierofanga [76]

Answer:

a force of 1250lb is exerted

Step-by-step explanation:

since the force of the wind varies jointly as the area of the surface and the square of the velocity,

let f = force

a = area

velocity =v

from the above statement, we find out that

f \alpha a*v^2----1

that is f= k* a* v^2     -----2

where k is a coefficent of proportionality

since velocity of wind in mph,v =50

and force in lb = 20

and surface area =1/5 th ft^2

from eqn 2

we have that

20 =k*\frac{1}{5}* 50^2

making k subject of the formula

we have that

k =\frac{20}{\frac{1}{5} *50^2 } =\frac{1}{25} (lb.mph^-1.ft^-2)

that means that f =\frac{1}{25} *a *v^2  ---3

however, when velocity = 125mph

surface area =2ft^2

putting values in eqn 3 we have

f= \frac{1}{25}*2*125^2 = 1250 lb

hence a force of 1250lb is exerted

7 0
3 years ago
What is 62.8 divided by 4
Rom4ik [11]

Answer:

15.7

Step-by-step explanation:

use a calculator lol

7 0
3 years ago
Read 2 more answers
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