All categories

3 years ago

Pls help. Evaluate the expression 3.14(a2 + ab) when a = 3 and b = 4. (Input decimals only, such as 12.71, as the answer.)

Mathematics

1 answer:

givi [52]3 years ago

4 0

3.14(3(2) + 3(4))
3.14( 6 + 12)
3.14(18)
=56.52

You might be interested in

canning operation is designed to fill cans with 14.5 oz of ingredients, on average, with a standard deviation of 0.1 oz. Nine ca

Pavlova-9 [17]

Answer:

SE = 0.025

Step-by-step explanation:

We are given;

Sample mean; x¯ = 14.52

Sample standard deviation; s = 0.075

Sample size; n = 9

Now,formula for standard error of sample mean is;

SE = s/√n

SE = 0.075/√9

SE = 0.075/3

SE = 0.025

3 0

3 years ago

Which expression gives the determinant of the matrix

BartSMP [9]

If the matrix is of 2 by 2 then we can find the determinant of the matrix.

$\begin{bmatrix}a & b\\ c & d\end{bmatrix}$

Then (ad - bc ) gives you the determinant of the matrix.

For example,

$\begin{bmatrix} 2 & 4\\ 1 & -2 \end{bmatrix}$

= (2)(-2) - (1)(4)

= - 4 - 4

$\begin{bmatrix} 2 & 4\\ 1 & -2 \end{bmatrix}$ = -8

3 0

3 years ago

Read 2 more answers

7. Find f(9) when f(x) = 12 (17 – 3x) *

Radda [10]

Answer:

-120

Step-by-step explanation:

6 0

3 years ago

3. Samantha earns $7.80 per hour. If her regular hours are 40

ddd [48]

Answer:

468

Step-by-step explanation:

312 for the regular 40 hours then overtime for 10 hours would be 7.80 doubled times 10

3 0

3 years ago

Disney held a breakfast for parents and their children to eat with Mickey and Minnie MouseAdult tickets cost $17.95 and children

ratelena [41]

This is a problem for 2 equations and 2 unknown.
so let x be the number of adults in the breakfast
y be the number of children present in the breakfast

so the total people attended is 500, in equation form
x + y = 500

and the total sales made by disney is $ 7355, in equation
17.95x + 12.95y = 7355

so we can solve the equation simultaneously so solve for the values of x and y

so the number of adults at the breakfast x = 176 adults and y = 324 children

5 0

3 years ago