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3 years ago

A student earned a grade of 80% on a math test that had 20 problems. how many problems on the test did the student answer

Mathematics

1 answer:

Mekhanik [1.2K]3 years ago

3 0

16 questions where answered correctly.

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−7x−6y=2 7x+4y=−6 solve for x and y

ikadub [295]

Answer:

$\mathrm{The\:solutions\:to\:the\:system\:of\:equations\:are:x=-2,\:y=2}$

Step-by-step explanation:

$\begin{bmatrix}-7x-6y=2\\ 7x+4y=-6\end{bmatrix}$

$\mathrm{Substitute\:}x=-\frac{2+6y}{7}$

$\begin{bmatrix}7\left(-\frac{2+6y}{7}\right)+4y=-6\end{bmatrix}$

$\begin{bmatrix}-2-2y=-6\end{bmatrix}$

$\mathrm{For\:}x=-\frac{2+6y}{7}$

$\mathrm{Substitute\:}y=2$

$x=-\frac{2+6\cdot \:2}{7}\\\\x=-2$

5 0

2 years ago

A local water company charges a flat fee of $5 per month, plus $0.0007 per gallons, and $0.0009 per gallon for every gallon for

cestrela7 [59]

Answer:

Total cost= $51

Step-by-step explanation:

Giving the following information:

Fixed cost= $5

From 0 to 40,000 gallons= $0.0007 per gallon

From 40,001 to infinity= $0.0009

We need to calculate the total cost for 60,000 gallons:

Total cost= 5 + 40,000*0.0007 + 20,000*0.0009

Total cost= $51

7 0

2 years ago

Solve the equation. show all work 18^(r-10)=93

Elina [12.6K]

Recall the logarithm rules :

a^y = x is the same as log_a x = y

In this case,

a = 18
y = r - 10
x = 93

So,

18^ (r-10) = 93

is the same as

log_18 93 = r - 10

Solve for r to get :

10 + log_18 93 = r

3 0

3 years ago

What is 0.17 repeating as a simplified fraction?

Nutka1998 [239]

Answer:

If you multiply 0.17 by 100 , you get 17 . Similarly, if you divide 17 by 100 , you get 0.17 . Thus, the fraction form for 0.17 is 17100 .

Step-by-step explanation:

4 0

3 years ago

Derrick goes to the store and buys a pair of shoes for $79.99, a shirt for $24.99, and a pair of shorts for $34.99. If the sales

alexandr402 [8]

Answer:

sales tax is 11.89745 round if u want

Step-by-step explanation:

i just added 8.5 percent

6 0

2 years ago