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Sonbull [250]
3 years ago
5

7 – 4 (3a – 5) I NED HLP ASAP. I WILL TRY BRAINLIEST TO FIRST ANSWER. EXPLANATION ALSO NEEDED

Mathematics
1 answer:
Lina20 [59]3 years ago
6 0

The answer is a = 2.25.

Simplifying

7 + -4(3a + -5) = 0

Reorder the terms:

7 + -4(-5 + 3a) = 0

7 + (-5 * -4 + 3a * -4) = 0

7 + (20 + -12a) = 0

Combine like terms: 7 + 20 = 27

27 + -12a = 0

Solving

27 + -12a = 0

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-27' to each side of the equation.

27 + -27 + -12a = 0 + -27

Combine like terms: 27 + -27 = 0

0 + -12a = 0 + -27

-12a = 0 + -27

Combine like terms: 0 + -27 = -27

-12a = -27

Divide each side by '-12'.

a = 2.25

Simplifying

a = 2.25

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A dog walking service charges a $19 one-time fee, plus $40 per week. The
rusak2 [61]

Answer:

Kevin's estimate is incorrect. When x=4, the value of y is $116, which is not close to

$180.

Step-by-step explanation:

7 0
3 years ago
(2.4 + 2/5) / 1/5 = ? please show work, and answer as a fraction.
nignag [31]
2.4 +2/5 = 2.8
2.8 / 1/5= 70 / 5 = 14 / 1
5 0
4 years ago
The Sahara Desert has an area of approximately 9,400,400 km2. While estimates of its average depth vary, they center around 150
dolphi86 [110]

Answer:

1.128048 \times 10^{25} grains of sand are in the Sahara Desert

Step-by-step explanation:

Given :

The Sahara Desert has an area of approximately 9,400,400 sq.km.

Depth = 150 m

To Find :Approximately how many grains of sand are in the Sahara Desert?

Solution:

Area of Sahara desert = 9,400,400 sq.km.

1 km^2 = 1000000 m^2

So, 9,400,400 km^2 = 1000000 \times 9400400 m^2

9,400,400 km^2 =9.4004 \times 10^{12}m^2

Volume of sand =Area \times depth

                           =1.41006\times 10^{15} m^3

1 m ^3 = 1000000 cm^3

So, 1.41006\times 10^{15} m^3 = 1.41006\times 10^{15} \times 1000000cm^3

1.41006\times 10^{15} m^3 =1.41006 \times 10^{21}cm^3

1 cubic cm holds grains of sand = 8000

1.41006 \times 10^{21}cm^3 holds grains of sand = 1.41006 \times 10^{21} \times 8000

                                                                                    = 1.128048 \times 10^{25}

Hence 1.128048 \times 10^{25} grains of sand are in the Sahara Desert

7 0
3 years ago
Solve this question and how to do it
satela [25.4K]

Answer:

Step-by-step explanation:

7/15 + 3/5

I'd multiply 3/5 by 3 so that both of the denominators (bottom number) are the same.

Now all we have to do is add the Numerators tog

7/15 + 9/15ether (the top number)

7/15 +9/15 = 16/15 or 1 1/15

6 0
3 years ago
Read 2 more answers
F(x)=(x-2)^2+3 What is the vertex, axis of symmetry, the maximum or minimum value, and the range
lukranit [14]

Answer:

y=x2−4x+7

or you can do it is way y=(x−2)2+3

Step-by-step explanation:

4 0
3 years ago
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