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3 years ago

So far you have completed 80% of the problems for your math exam. Your exam

Mathematics

2 answers:

Nataly [62]3 years ago

7 0

Answer:

I think 9.

Step-by-step explanation:

Good Luck have the best day ever!!!༼ つ ◕_◕ ༽つ

zmey [24]3 years ago

5 0

Answer:

Problems left to complete = 9

Step-by-step explanation:

Given that:

Number of problems on the test = 45

Percent of completed problems = 80%

Number of completed problems = $\frac{80}{100}*45$

Number of completed problems = 0.8 * 45 = 36

Problems left to complete = 45 - 36

Problems left = 9

Hence,

Problems left to complete = 9

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Solve the following system in three variables using linear combinations. 3x−2y+z=0 4x+y−3z=−9 9x−2y+2z=20

goblinko [34]

Answer:

The solution of the system of equations is

x=2,y=7,z=8

Step-by-step explanation:

we have

3x-2y+z=0

isolate the variable z

z=2y-3x ------> equation A

4x+y-3z=-9 ----> equation B

9x-2y+2z=20 ----> equation C

substitute equation A in equation B and equation C

4x+y-3(2y-3x)=-9

4x+y-6y+9x=-9

13x-5y=-9 -------> equation D

9x-2y+2(2y-3x)=20

9x-2y+4y-6x=20

3x+2y=20 ----> equation E

Solve the system

13x-5y=-9 -------> equation D

3x+2y=20 ----> equation E

Multiply equation E by 2.5 both sides

2.5*(3x+2y)=20*2.5

7.5x+5y=50 -----> equation F

Adds equation D and equation F

13x-5y=-9

7.5x+5y=50

------------------

13x+7.5x=-9+50

20.5x=41

x=41/20.5

x=2

Find the value of y

substitute the value of x in the equation E

3(2)+2y=20

6+2y=20

2y=20-6

2y=14

y=7

Find the value of z

Substitute the value of x and the value of y in equation A

z=2y-3x

z=2(7)-3(2)

z=14-6

z=8

therefore

The solution of the system of equations is

x=2,y=7,z=8

5 0

3 years ago

URGENT I HAVE ALMOST 0 TIME LEFT I NEED LAST MINUTE HELP

jonny [76]

Answer:

The zeros are the points where the parabola intercepts the x-axis.

$\sf x = 7 \implies x - 7 = 0$

$\sf x = 1 \implies x - 1 = 0$

$\sf \implies y = a(x - 7)(x - 1)$ where a is some constant

If the parabola passes through point (3, 4) then:

$\sf \implies a(3 - 7)(3 - 1) = 4$

$\sf \implies a(-4)(2) = 4$

$\sf \implies -8a = 4$

$\sf \implies a = -\dfrac12$

So the equation of the parabola is:

$\sf y = -\dfrac12(x - 7)(x - 1)$

Or in standard form:

$\sf y = -\dfrac12x^2+4x-\dfrac72$

7 0

2 years ago

A 20-ounce soda cost $1.20. How much does the soda cost per ounce?

Andre45 [30]

Answer:

Your answer is 0.06, hun!

Step-by-step explanation:

1.20 divided by 20 = 0.06

Stay happy-Livia

3 0

2 years ago

Jana is on a two-day hike. The function graphed shows the total distance she hiked, in miles, after x hours on the second day.

evablogger [386]

Just took the same quiz.

The slope is 2.
The slope represents the number of miles hiked every hour.

4 0

3 years ago

Read 2 more answers

Your uncle gave you $1.80 with which to buy a present. This covered 3/10 of the cost. How much did the present cost?

s2008m [1.1K]

Answer:

Step-by-step explanation:

Divide 1.80 by 3, then multiply that answer by 10.

6 0

3 years ago