Need help thank u!!!

Mathematics

1 answer:

navik [9.2K]4 years ago

4 0

Look up the 30-60-90 triangle and watch some tutorial videos to help :)

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If x=1/4 and y=3/7, evaluate the following expression: 7x−4y

iVinArrow [24]

Answer:

1/28

Step-by-step explanation:

The expression is 7x-4y

x = 1/4
y= 3/7

Replace x by 1/4 and y by 3/7

7x-4y
7*( $\frac{1}{4}$ ) - 4*( $\frac{3}{7}$ ) multiply 1 by 7 and 4 by 3
$\frac{7}{4}$ - $\frac{12}{7}$ multiply 7/4 by 7 and 12/7 ny 4 to get the same denominator
$\frac{49-48}{28}$
1/28

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3 years ago

the perimeter of a standard sized rug is 40 ft. The length is 2 ft longer than the width. Find the dimensions.

Rufina [12.5K]

The width is 9.
The length is 11.

7 0

4 years ago

A cylinder has a volume of 136 cubic centimeters. What is the volume of a cone with the same height and the same diameter

Gelneren [198K]

Volume of a cylinder = pi r^2 h If the cone has exactly the same measurements then its formula is going to be
V_cone = 1/3 pi r^2 h. If that's the case the only difference is that the Cone's volume is 1/3 that of the cylinder
V_cone = 1/3 V_cylinder
V_cone = 1/3 136 cubic cm.
V_cone = 45.33 cubic cm.

7 0

3 years ago

I NEED HELP PLEASE! :)

Andrej [43]

Answer:

Perpendicular

Step-by-step explanation:

To tell if the lines are perpendicular/parallel, you must look at the slope, but in this case, you must first get y by itself, like so:

3x + 7y = 15

-3x - 3x

___________

7y = -3x + 15