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Zigmanuir [339]

3 years ago

8

John took 3 exams so far this semester. He scored 45, 65 and 80 on those 3 exams . What score does he need on the fourth exam to

average 70 or more on his exams?

1 answer:

Olegator [25]3 years ago

3 0

Answer:

$He \: needs \: to \: score \: 90 \: or \: more$

Step-by-step explanation:

$\frac{x + 45 + 65 + 80}{4} \geqslant 70\Leftrightarrow x + 190 \geqslant 280\Leftrightarrow x \geqslant 90$

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Given sin z=4/5 and cos x=3/5. What is the ratio for tan z? Enter your answer in the boxes as a fraction in simplest form.

Minchanka [31]

The answer is: "   $\frac{4}{3}$ " .<span>
______________________________________________________
Explanation:
______________________________________________________
Note:  tan z = (sin z/ cos z) ;

tan z = (4/5) / (3/5) ;

= </span> $\frac{4}{5}$ * $\frac{5}{3}$ ; <span>
Note: Both of the "5 ' s" cancel out to "1" ; since: "{5 ÷ 5 = 1 }" ;

And we rewrite as:

</span>→    " $\frac{4}{1}$ * $\frac{1}{3}$ " ;

= $\frac{(4*1)}{(1*3)}$ ;
<span>
= " </span> $\frac{4}{3}$ " .
<span>_______________________________________________________
The answer is: " </span> $\frac{4}{3}$ " .
_______________________________________________________

8 0

4 years ago

Read 2 more answers

What is the area of the figure if x = 25 cm and y=20 cm?<br> Use 3.14 to approximate it.

Akimi4 [234]

The area of the circle is 6,358.5cm²

<h3>Area of the circle</h3>

The formula for calculating the area of a circle is expressed as;

A = πr²

r is the radius = x + y

r = 25 + 20 = 45cm

Substitute the given parameters into the formula to have:

A = 3.14(45)²

A = 6,358.5cm²

Hence the area of the circle is 6,358.5cm²

Learn more on area of a circle here; brainly.com/question/10645610

4 0

2 years ago

Garrett wants to make a circular pond in his yard and put a low fence around the edge. What is the largest area pond Garrett can

Black_prince [1.1K]

Answer:

The answer is C. 1472.61 square feet

Step-by-step explanation:

If you are familiar with Pi (π) you can do a lot of fun stuff with math.

Let's review some values:

A = Area, C = circumference, r = radius, π = 3.14159 (commonly rounded off to 3.14).

You might already know that the area of a circle can be calculated with the formula A = π r2 (pi r squared).

However, we do not know the radius in this instance so this formula isn't going to work for us.

Let's try a different way.

We do know the circumference. The circumference is simply the length of the fencing, 136 feet.

So we'll use this formula:

A = C2 / 4π

C2 is 136 x 136, or 18,496. Don't be scared off by this huge number; we're going to whittle it down.

4π = 12.56

18,496/12.56 (or 18,496 divided by 12.56) = 1472.61

Wasn't that fun?

3 0

3 years ago

Read 2 more answers

Please help me quick ASAP

ddd [48]

I believe the answerer is C

8 0

3 years ago

Read 2 more answers

X - 3y = 4<br> 2x - 5y = 8 <br> solve by substitution

Shkiper50 [21]

Answer:

y = 0

x = 4

Explanation:

x - 3y = 4

2x - 5y = 8

<u>make x the subject,</u>

x - 3y = 4

x = 4 + 3y __ equation 1

2x - 5y = 8

x = (8+5y)/2 __ equation 2

<u>using substitution method:</u>

(8+5y)/2 = 4 + 3y

8 + 5y = 8 + 6y

6y - 5y = 8 - 8

y = 0

Find x,

x = 4 + 3y

x = 4 + 3(0)

x = 4

7 0

3 years ago

Read 2 more answers