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liq [111]
3 years ago
14

A wheel has a diameter of 21cm calculate its circumference

Mathematics
2 answers:
notsponge [240]3 years ago
8 0
21•3.14=65.94   the circumference is 65.94
Andrews [41]3 years ago
7 0
I give u the formula for circumference. 2μr which is r = half of the diameter. just calculate it using ur calculator. sorry please
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Find the volume of the solid under the plane 5x + 9y − z = 0 and above the region bounded by y = x and y = x4.
svp [43]
<span>For the plane, we have z = 5x + 9y

For the region, we first find its boundary curves' points of intersection.
x = x^4 ==> x = 0, 1.

Since x > x^4 for y in [0, 1],

The volume of the solid equals

\int\limits^1_0 { \int\limits_{x^4}^x {(5x+9y)} \, dy } \, dx = \int\limits^1_0 {\left[5xy+ \frac{9}{2} y^2\right]_{x^4}^{x}} \, dx  \\  \\ =\int\limits^1_0 {\left[\left(5x(x)+ \frac{9}{2} (x)^2\right)-\left(5x(x^4)+ \frac{9}{2} (x^4)^2\right)\right]} \, dx  \\  \\ =\int\limits^1_0 {\left(5x^2+ \frac{9}{2} x^2-5x^5- \frac{9}{2} x^8\right)} \, dx =\int\limits^1_0 {\left( \frac{19}{2} x^2-5x^5- \frac{9}{2} x^8\right)} \, dx \\  \\ =\left[ \frac{19}{6} x^3- \frac{5}{6} x^6- \frac{1}{2} x^9\right]^1_0

=\frac{19}{6} - \frac{5}{6} - \frac{1}{2} =\bold{ \frac{11}{6} \ cubic \ units}</span>
8 0
3 years ago
Find b(4) in the sequence given by<br> b(1) = -5 <br>b(n) = b(n-1) + 9<br><br><br>b(4) =​
Harrizon [31]

Answer: 22

Step-by-step explanation:

I got it right on khan academy

7 0
3 years ago
chen is buying a ham. He wants to divide it into 6.5-ounce servings for 12 people. write and solve a division equation to find w
OLga [1]

Answer:

Amount of people to serve x Serving Size = Size of ham

12 x 6.5 = ?

=78

Step-by-step explanation:

Looking for size ham chen should buy = ?

Amount of people to serve = 12

Serving Size = 6.5-ounce

Equation=

Amount of people to serve x Serving Size = Size of ham

12 x 6.5 = ?

=78

8 0
3 years ago
Pls help and also no links plz​
Anettt [7]

Answer:

I think it's 5 or7

Step-by-step explanation:

hope it helps you

8 0
2 years ago
Wade has already spent $7 of his earnings. He could represent the total amount he has left using the expression a − 7 ⁢   .
valentinak56 [21]
The answer is b because 7 plus 2 equals 9 and a equals whole amount then his current amount is A-9
7 0
3 years ago
Read 2 more answers
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