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Nataly_w [17]
3 years ago
7

Richard can mow the lawn three times as fast as Terri. Together, they finish mowing the lawn in 20 minutes. Which of the followi

ng equations would describe how many minutes it would take Richard to mow the lawn by himself? a. 1/x+1/3x=1/20 b. 1/x+1/3=1/20 c. 20 (1/x+1/3x)=1/20 d. x+3x=1
Mathematics
1 answer:
marysya [2.9K]3 years ago
7 0

Answer:

d it adds the two up and only mutiplys terris amount.

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ANSWER ASAP!! WILL MARK BRAINLIEST!
ra1l [238]

Answer:

1 and 3

Step-by-step explanation:

4 0
3 years ago
Solve using algebreic methods y=x^2+5x, y=7-x
adelina 88 [10]

Answer:

x = 1 and x = -7

Step-by-step explanation:

Given that,

y=x^2+5x  ...(1)

and

y = 7 -x ....(2)

Put the value of y from equation (2) in (1)

7-x=x^2+5x\\\\x^2+5x-7+x=0\\\\x^2+6x-7=0\\\\x^2+7x-x-7=0\\\\x(x+7)-1(x+7)=0\\\\(x-1)(x+7)=0

So,

x = 1 and x = -7

Hence, the solution of the given equations is x = 1 and x = -7

6 0
3 years ago
Brian wanted to wallpaper a wall that was 8,1/8 feet tall and 5,3/4 feet wide. How many square feet of wallpaper does Brian need
Fantom [35]
8,1/8 = 65/8
5,3/4 = 23/4

Multiply 65/8 by 23/4
= 1495/32
= 46 23/32 square feet (if they want it kept as a fraction)
Or 46.72 square feet (if they want a decimal)
4 0
3 years ago
With the substitution method, which variable should you solve for first?
nignag [31]
It really does not matter, I tend to solve for x first simply because it comes before y, but you do whatever is easier for you.
5 0
4 years ago
Name two congruent circles. A and C B and C A and D B and D
alexandr1967 [171]

Answer:

1) A and D

The radius is the distance from the center of a circle to any part of the edge. Both A and D have a radius of three, regardless of what direction they go.

2)  5"

In circle C we see that there is a line segment that is 5" that goes from the center to the edge, or the radius.

3) C

The different variables are representing different points on the circles. The circle that contains a line connecting C and L is circle C.

4) BN

Circle B contains a radius that is the distance from B to N, or BN.

5) EF

The diameter is the distance of a  straight line that was pass through the middle of a circle, or its width. The diameter is double the radius. In circle A we see that line EF passes through the center put goes all the way across the circle.

6)IJ

Line IJ isn't even linear, so it could not be the radius. Both AG and BH are straight lines that represent the radius.

7) 6"

The diameter is always twice the radius. In circle A the radius is 3, so the diameter is 6.

8) A and D

Just as we said in the first answer, A and D both have a radius that measures 3 inches.

I hope this helps!

Step-by-step explanation:

5 0
3 years ago
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