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VMariaS [17]
3 years ago
7

Lisa solved 3x2 + 1 = 28 as shown.

Mathematics
1 answer:
Alekssandra [29.7K]3 years ago
4 0

x squared = 9  NOT x

x = square roots of 9 which is +3 or  -3.

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Gro-Rite fertilizer costs $12.75 for three pounds. Green Zone fertilizer costs $4.50 per pound. Compare the price per pound of t
Triss [41]
Go-rite: 12.75 / 3 = 4.25 (go-rite is $4.25 per pound)

Green zone: $4.50

4.50- 4.25= 0.25

Go-rite is cheaper by .25
7 0
3 years ago
Evaluate 1 whole number 2/5 + 3/4 and give your answer to one significant figure​
ehidna [41]

Answer:

The answer is

<h3>2 to 1 significant figure</h3>

Step-by-step explanation:

1 \frac{2}{5}  +  \frac{3}{4}

To solve the question first convert the mixed fraction to an improper fraction

That's

1 \frac{2}{5}  =  \frac{7}{5}

So we have

\frac{7}{5}  +  \frac{3}{4}

Find the LCM of the fractions

The LCM of 5 and 4 is 20

That's

\frac{7}{5}  +  \frac{3}{4}  =  \frac{7(4) + 3(5)}{20}  =  \frac{28 + 15}{20}

=  \frac{43}{20}

= 2.15

We have the final answer as

<h3>2 to 1 significant figure</h3>

Hope this helps you

3 0
3 years ago
Solve the simultaneous equations
Contact [7]

Answer:

The solution for given system of equations is: x = 6 and y = 3

Or

(6,3)

Step-by-step explanation:

Given equations are:

3x+4y=30\ \ \ Eqn\ 1\\3x-y=15\ \ \ \ Eqn\ 2

There are three methods to solve simultaneous equations

  1. Elimination
  2. Substitution
  3. Co-efficient method

We will use the elimination method as the coefficients of x in both equations are already same

Subtracting equation 2 from equation 1

3x+4y - (3x-y) = 30-15\\3x+4y-3x+y = 15\\5y = 15\\\frac{5y}{5} = \frac{15}{5}\\y = 3

Putting y = 3 in equation 2

3x-3 = 15\\3x = 15+3\\3x = 18\\\frac{3x}{3} = \frac{18}{3}\\x =  6

Hence,

The solution for given system of equations is: x = 6 and y = 3

Or

(6,3)

7 0
3 years ago
Please help! I'm giving branniest for the correct answer! (SHOW WORK)​
scoray [572]

Answer:

102

Step-by-step explanation:

it's a parallelogram so it's BxH

A = 15x8 = 120

inside rectangle A is LxW

6x3 = 18

subtract the inside from the outside

120-18 = 102

6 0
3 years ago
A box of cereal contains 18 cups. Ben eats 2 1/4 cups every serving. How many servings can he eat?
g100num [7]
Ben can have 8 servings total!

Hope this helps! :)
4 0
3 years ago
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