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yanalaym [24]
3 years ago
9

Solve and show work

Mathematics
1 answer:
Alika [10]3 years ago
6 0
84 gallons/(2.8 gpm) = 30 minutes
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Mariana averaged 80 on her first three math exams. The first score was 86. The second score was 74. What was the third exam scor
Anna71 [15]

The three scores are 86, 74, and an unknown score x. The average (i.e. the sum divided by how many there are) is 80, so we have

\dfrac{86+74+x}{3}=80

Multiply both sides by 3 and you get

160+x=240

Subtract 160 from both sides to get

x=240-160=80

Note: you could solve this exercise very quickly if you notice that the two numbers, 86 and 74, are symmetrical with respect to 80, which is the average. So, the third number must be the average.

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3 years ago
Which of these are mathematical laws that help us solve numerical problems? decimals graphs formulas percentages fractions
ladessa [460]
Formulas are mathematical laws that help us solve problems.

Decimals are a type of number; graphs are displays of data; percentages are comparisons of a number to 100; and fractions are a type of number.
6 0
3 years ago
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A square has side length (x+5) units. What is it’s area
daser333 [38]

The area of square is x^{2}+10 x+25 square units

<h3><u>Solution:</u></h3>

Given that square has side length (x+5) units

To find: area of square

<em><u>The area of square is given as:</u></em>

\text {Area of square }=\mathrm{a}^{2}

Where "a" is the length of side

From question, length of each side "a" = x + 5 units

Substituting the value in above formula,

\text {Area of square }=(x+5)^{2}

{\text {Expanding }(x+5)^{2} \text { using the algebraic identity: }} \\\\ {(a+b)^{2}=a^{2}+2 a b+b^{2}}\end{array}

\begin{array}{l}{\text {Area of square }=x^{2}+2(x)(5)+5^{2}} \\\\ {\text {Area of square }=x^{2}+10 x+25}\end{array}

Thus the area of square is x^{2}+10 x+25 square units

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3 years ago
HELPPPP PLEASEEE!!!!!
timurjin [86]

Answer: the answer is the second one.

Hope this helps

Step-by-step explanation:

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3 years ago
What is 168 cm in feet
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5.51181 in feet. Hope this helps

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