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Soloha48 [4]
3 years ago
12

there are three exams in a marking period. A student received grades of 75 and 81 on the first two exams. What grade must the st

udents earn on the last to get an average of no less than 80 for the marking period?
Mathematics
1 answer:
gulaghasi [49]3 years ago
6 0

Answer: average means add all scores and divide by number of scores earned

last score is x

so the sum is 75+81+x

3 scores so (75+81+x)/3=average

must be no less than (greater than or equal to 80)

(75+81+x)/3≥80

solve

times both sides by 3 to clear fraction

75+81+x≥240

156+x≥240

minus 156 from both sides

x≥84

the studen must earn at least 84 on last exam

Step-by-step explanation:

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1.)Each sandwich costs $.02 per cubic inch to make. What is the cost of each sandwich?
kirza4 [7]
Part 1) <span>Each sandwich costs $.02 per cubic inch to make. What is the cost of each sandwich?

</span>volume for cube sandwich is 125 in³
volume for pyramid sandwich is 41.67 in³

cost of each cube sandwich=0.02*125-----> $2.5

cost of each  pyramid sandwich=0.02*41.67-----> $0.83

the answers Part 1) are
a) cost of each cube sandwich is $2.5
b) cost of each pyramid sandwich is $0.83

Part 2) <span>If each sandwich sells for $4.00 and Mr. Sammie sells 100 Cube sandwiches and 100 Pyramid Sandwiches, how much profit would Mr. Sammie make?
</span>
we know that
Profit=Sells-Costs

step 1
 find the sells
Sells=200*$4-----> $800

step 2
find the costs
Costs=100*$2.5+100*$0.83----> $333

step 3
find the profit
Profit=Sells-Costs
Profit=$800-$333-----> $467

the answer Part 2) is
the profit is $467
7 0
3 years ago
The length of the hypotenuse of a right triangle is 34 inches and the length is 34 inches and the length of one of its legs is 1
nata0808 [166]

Answer:

The length of the other leg of this right angled triangle is 30 inches.

Step-by-step explanation:

We are given the following in the question:

A right angles triangle with the hypotenuse of 34 inches and the length of one of its legs is 16 inches.

Pythagoras theorem:

  • The sum of of square of two sides of a triangle is equal to the square of the hypotenuse.

Let x inches be the length of the other leg of this right triangle.

Thus, we can write the equation:

x^2 + (16)^2 = (34)^2\\x^2 + 256 = 1156\\x^2 = 900\\x = 30

Thus, the length of the other leg of this right angled triangle is 30 inches.

3 0
3 years ago
Bob wants to create two pens, as shown in the figure. One pen is for a garden and it needs a heavy duty fence to keep out the cr
sattari [20]
\bf \textit{the area of either pen is 2744, thus}\\\\&#10;A=xy\implies 2744=xy\implies \cfrac{2744}{x}=y

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notice... the dog's pen perimeter, does not include the side that's bordering the garden's, since that side will use the heavy duty fence, instead of the light one

so, the sum of both of those costs, will be the C(x)

\bf C(x)=\left( 30x+\cfrac{82320}{x} \right)+\left( 10x+\cfrac{27440}{x} \right)&#10;\\\\\\&#10;C(x)=40x+\cfrac{109760}{x}

so, just take the derivative of it, and set it to 0 to find the extremas, and do a first-derivative test for any minimum

8 0
3 years ago
A team of bakers can roll and form 5 dozen pretzels in 9 minutes. How many pretzels can this team form in 1 hour?
tino4ka555 [31]
The answer should be 3600

8 0
3 years ago
Please help me with this question!!!!
beks73 [17]

Answer:

answer is A

Step-by-step explanation:

please I need brainlist

4 0
2 years ago
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