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3 years ago

Need help on these problems plz its for a grade

Mathematics

2 answers:

Ronch [10]3 years ago

6 0

C: 390 because 5 times 6 is 30 and 30 times 13 is 390

irina [24]3 years ago

4 0

Answer:

C. 390 Cubic units

5 * 6 * 13 = 390 cubic units

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ANSWER PLSS! 3)

Artist 52 [7]

Answer:

20 I'm pretty sure it's right but if not sorry

Step-by-step explanation:

80x.2=16

16÷.8= 20

6 0

3 years ago

Read 2 more answers

What is the sum of 2x^2-5x-2and 4x^2-6x+8

rjkz [21]

Step-by-step explanation:

this should be correct but im not 100%sure

6 0

2 years ago

the doctor recommended that Matt increase the number of calories you consume from 2000 to 2800 by what percent did the number of

nikdorinn [45]

Answer:

40% number of calories have increased

Step-by-step explanation:

Old Value ( Calories consume before) = 2000

New Value (increase in Calories consumed) = 2800

We need to find by what percent did the number of calories increase

To find percent increase, the formula used is:

$Percent\: increase=\frac{New\:Value-Old\:Value}{Old\:Value}\times 100%$

Putting values in formula and finding percent increase

$Percent\: increase=\frac{New\:Value-Old\:Value}{Old\:Value}\times 100\%\:\\Percent\: increase=\frac{2800-2000}{2000}\times 100\%\: \\Percent\: increase=\frac{800}{2000}\times 100\%\: \\Percent\: increase=0.4\times 100\%\: \\Percent\: increase=40\%$

So, 40% number of calories have increased

8 0

3 years ago

Find the parametric equations for the line that is tangent to the given curve at the given parameter (3cost)i (t^4 -3sint)j

ale4655 [162]

Answer:

Following are the solution to this question:

Step-by-step explanation:

Please find the complete question in the attached file.

In the given equation, when the point t=0

So,

$\to r(0) = (3 \cos 0)i + (0^4 - 6 \sin 0)j + (2e^{3\times 0})k)$

$= (3 \times 1)i + (0 - 0)j + (2e^{0})k)\\\\ = 3i + 0j + (2 \times 1)k)\\\\ = 3i + 0j + 2k \\$

The value of the coordinates are $3, 0, 2$ . so, the equation of the line is:

$\to \frac{(x-3)}{3 \cos \ t} = \frac{(y-0)}{(t^{4}-6 \sin \ t)} = \frac{(z-2)}{2e^{3t}}=k$

5 0

3 years ago

There are 400 students in a school. Fifty five percent are girls. How many boys are there?

ki77a [65]

1) 55% is girls, then
100-55=45% is boys.

2) 45%=0.45 or 2) 400 ----100%
3)400*0.45= 180 boys x -----45% x=400*45/100=180 boys

Answer is 180 boys.

5 0

3 years ago