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3 years ago

What is 9.946327812 to 1dp?

1 answer:

7 0

-- 'Truncated' to one decimal place, it's 9.9 ,

-- 'Rounded' to one decimal place, it's 9.9 .

(These two operations don't always produce the same result.)

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Evaluate 5x^2 + 2 for x = -1.

iogann1982 [59]

Answer:

Step-by-step explanation:

If x = -1 then we need to plug that into the equation.

5(-1)^2 +2

Then solve for the first part

5(1) + 2

Then multiply.

5 + 2

Then add

Hope this helped!

6 0

3 years ago

Read 2 more answers

40 POINTS PLEASE HELP Joe and Bill are working on building a stone wall that will be 120 feet long. Joe works from one end and i

andrew-mc [135]

Answer:

26.67 hours or 26 hours and 40 minutes.

Step-by-step explanation:

To find out how long will it take for Joe and Bill to finish building the wall together, first find their individual work rates in feet per hour:

Bill:

$B = \frac{10\ ft}{4 h} \\B = 2.5\frac{\ ft}{h}$

Joe:

$B = \frac{10\ ft}{5 h} \\B = 2.0\frac{\ ft}{h}$

Their combined work rate is:

$W =J+B\\W = 2.5\frac{\ ft}{h}+2.0\frac{\ ft}{h}\\W=4.5\frac{\ ft}{h}$

Then, divide the total size of the wall by their work rate to find the time spent to finish it:

$t = \frac{120\ ft}{2.5\frac{\ ft}{h}} \\t= 26.67\ h$

3 0

4 years ago

What is the answer to 3/4 divided by 2/5

lozanna [386]

3/4 divided by 2/5 is 15/8 or 1 7/8.

Steps in dividing fractions.

3/4 ÷ 2/5

1st fraction = 3/4
2nd fraction = 2/5

Step 1. find the reciprocal of the 2nd fraction.
2/5 ⇒ 5/2 *reciprocal means to swap their places.

Step 2. Multiply the 1st fraction to the reciprocal of the 2nd fraction
3/4 * 5/2 = 3*5 / 4*2 = 15 / 8

Step 3. Simplify the fraction
15/8 can be simplified into a mixed fraction 1 7/8

6 0

3 years ago

Read 2 more answers

A pair of supplementary angles are_____________. <br>A. A and B<br>B. B and D<br>C. C and E

shutvik [7]

A pair of supplementary angles are C and E. We know that B, D, and E are all congruent, and can see that both C and B, and C and D would form supplementary angles. So, we can also use E to form supplementary angles.

Hope this helps! :)

4 0

3 years ago

PLEASE HELP....!!!!!! Need answer ASAP, so confused

Ber [7]

Answer:

$b. \ y=3cos(3\theta)$

Step-by-step explanation:

The cosine function is a trigonometric function whose curve is symmetric with respect to the y-axis, hence this function is said to be even. This function has the following form:

$y=acos(b \theta)$

The amplitude of the plotted graph is 3 that represents half the distance between the maximum and minimum values. Since at x = 0, y = 3, this y-value is the value of a. On the other hand, the period, which is the length of one cycle of the curve, can be found as $T=\frac{2\pi}{3}$ and:

$T=\frac{2\pi}{b} \therefore b=\frac{2\pi}{T}=\frac{2\pi \times 3}{2\pi}=3$

Finally:

$\boxed{y=3cos(3\theta)}$

6 0

3 years ago