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4 years ago

Ernesto tried to determine the solution for the system of equations using substitution. His work is shown below.

Mathematics

2 answers:

AysviL [449]4 years ago

7 0

Step 3. he forgot to multiply 3 and 7.

storchak [24]4 years ago

3 0

Step 3 he forgot to multiply 3 by 7

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Its 94 i said it first tho so does that mean i get brainliest

Softa [21]

Answer:

YA if you said it first ya you are supposed to get brainlies ONLY if the question says will give brainliest if your right

Step-by-step explanation:

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3 years ago

Jada walks up to a tank of water that can hold up to 10 gallons. When it is active, a drain empties water from the tank at a con

mars1129 [50]

Answer:

1 gallon per minute

it will take 5 minutes to completely drain

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Step-by-step explanation:

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3 years ago

Solve the quadratic equation by factoring 9x2+24+20=4

AnnyKZ [126]

Answer:

Final answer is $x=-\frac{4}{3}$ and $x=-\frac{4}{3}$ .

Step-by-step explanation:

Given equation is $9x^2+24x+20=4$ .

Now we need to solve that by factoring.

$9x^2+24x+20=4$

$9x^2+24x+20-4=0$

$9x^2+24x+16=0$

$9x^2+12x+12x+16=0$

$3x(3x+4)+4(3x+4)=0$

$(3x+4)(3x+4)=0$

$(3x+4)=0$ , $(3x+4)=0$

$3x+4=0$ , $3x+4=0$

$3x=-4$ , $3x=-4$

$x=-\frac{4}{3}$ , $x=-\frac{4}{3}$

Hence final answer is $x=-\frac{4}{3}$ and $x=-\frac{4}{3}$ .

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3 years ago

the area of a rectangle is 99ft^2,and the L is 7ft more than twice the width. find the dimension of the rectangle.

givi [52]

A = L * W
A = 99
L = 2W + 7

99 = W(2W + 7)
99 = 2W^2 + 7W
-2W^2 - 7W + 99 = 0
(-2W + 11)(W + 9) = 0

-2W + 11 = 0
-2W = -11
W = -11/-2
W = 5.5

W + 9 = 0
W = -9 .....not this one because it is negative

so the width (W) = 5.5ft <====
L = 2W + 7 .....2(5.5) + 7 = 18 ft is the length (L) <==

3 0

4 years ago

Expand and simplify the following <br>√3 (√3 - 1)<br>√5 (√10 + √2)

DIA [1.3K]

Answer:

3 - $\sqrt{3}$