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vfiekz [6]
3 years ago
5

You earned a 90% on a science test. You answered 18 questions correctly. How many questions were on the test?

Mathematics
2 answers:
Kruka [31]3 years ago
8 0
This is an easy one!

Answer = 20. 

(18/20) x 100 = 90%

So, 20 questions!
zalisa [80]3 years ago
5 0
There were twenty questions on the test, we can figure this out by writing your word problem as an equation: x= the amount of questions there are on the test, with this in mind the equation will be written out 18/x=90%, <span>then do the same to both sides of the equation, divide both sides by .90 which gets rid of the x on the left side and 18 divided by .90 = 20. So X = 20.</span>
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An assembly line produces 2 toasters per minute. It is 2:00pm and the line has finished 560 out of its goal of 900 for the day.
LenaWriter [7]

Answer:

I won't stop the line for a half hour break.

Step-by-step explanation:

<u>Proportions</u>

One quantity A is said to be proportional to other B if A can always be obtained by multiplying or dividing B by any constant number. Numbers {4,8,12} are proportional to {2,4,6} because they can be computed as twice their value

.

There is a situation described in the problem where we need to know if there will be enough time to produce the 900 toasters (the goal for the day) when the assembly line is stopped by half an hour.

Actual time: 2:00 pm

Final time: 5:00 pm

Rate of production: 2 toasters/minute

Actual production: 560 toasters

Updated goal: 900-560 = 340 toasters  

Those 340 toasters must be produced in the remaining 3 hours (180 minutes) of work. If the assembly line stops for half an hour (30 minutes), there will be only 150 minutes to finish the goal production. At a rate of 2 toasters/minute, there will be 2*150 = 300 toasters produced. But we need to produce 340 more toasters, so that break cannot be granted or we'll be 40 toasters under goal.

It the line keeps producing for 180 minutes, it would produce 2*180 = 360 toasters, 20 more than the goal.

Note: The maximum break time that can be granted is 20/2 = 10 minutes

4 0
4 years ago
Please help Cant figure it out
IrinaVladis [17]

Answer:

C

Step-by-step explanation:

If a number is to the power of a negative number, then it is just that number's reciprocal: e.g. y⁻ˣ = \frac{1}{y^{x} }

Therefore, m⁻² will be m² in the denominator, as n⁻³ will be n³ in the numerator.

That will look like \frac{3n^{3} }{5m^{2} }.

So, that is C.

3 0
4 years ago
find the mean of the data set. if necessary, round to the nearest tenth. 15.8, 14.9, 16.7, 17.6, 13.4 15 points
lana [24]
I believe that answer is 15.7.
6 0
3 years ago
Answer this question to chick you knowledge
NemiM [27]

Answer:

8.5 Yards

Step-by-step explanation:

Pythagorean Theorem: c = \sqrt{a^{2} +b^{2} }

a = 6

b = 6

Therefore: c = \sqrt{6^{2} +6^{2} } = 8.485

The path is 8.5 yards long

4 0
3 years ago
5y - 4x = -7<br> 2y + 4z = 14<br> Solve for x and y
castortr0y [4]

Answer:

et's solve for x.

5y−4x=−72y+4z

Step 1: Add -5y to both sides.

−4x+5y+−5y=−72y+4z+−5y

−4x=−77y+4z

Step 2: Divide both sides by -4.

−4x

−4

=

−77y+4z

−4

x=

77

4

y−z

Answer:

x=

77

4

y−z

Let's solve for y.

5y−4x=−72y+4z

Step 1: Add 72y to both sides.

−4x+5y+72y=−72y+4z+72y

−4x+77y=4z

Step 2: Add 4x to both sides.

−4x+77y+4x=4z+4x

77y=4x+4z

Step 3: Divide both sides by 77.

77y

77

=

4x+4z

77

y=

4

77

x+

4

77

z

Answer:

y=

4

77

x+

4

77

z

Step-by-step explanation:

I think that can help :) wanna chat add me as  friend

8 0
3 years ago
Read 2 more answers
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