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3 years ago

Math is to hard for meh

Mathematics

2 answers:

denis-greek [22]3 years ago

6 0

Answer:

C. 55

Step-by-step explanation:

20 * 2 3/4 = 20*2 + 20* 3/4 = 40 + 60/4 = 40 + 25 = 55

Another approach: you could rewrite 2 3/4 as 3 - 1/4

Then the question becomes:

20 * 3 - 20 * 1/4 = 60 - 20/4 = 60 - 5 = 55

sweet [91]3 years ago

3 0

Answer:

Step-by-step explanation:

2 and 3/4 is equal to 2.75 so just multiply 20 by 2.75 to get 55.

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Help with 3 & 4 please !!!

ra1l [238]

Answer:

the answer of 3 is probably (c)

7 0

3 years ago

Solve for x. 45(15x+20)−7x=56(12x−24)+6

Nady [450]

Answer:

The value of the equation for x is $x=\frac{1119}{2}$ or 559.5.

Step-by-step explanation:

Consider the provided equation.

$45(15x+20)-7x=56(12x-24)+6$

We need to solve the equation for x.

Use the distributive property: $a(b+c)=ab+ac$

$45(15x+20)-7x=56(12x-24)+6$

$675x+900-7x=672x-1344+6$

Add the like terms.

$668x+900=672x-1338$

Isolate the variable as shown:

$672x-668x=900+1338$

$4x=2238$

$x=\frac{2238}{4}$

$x=\frac{1119}{2}$

Hence, the value of the equation for x is $x=\frac{1119}{2}$ or 559.5.

4 0

3 years ago

Read 2 more answers

Henry's calculator is 2 1/4 inches wide and 5 1/4 inches long. What is the area of

grandymaker [24]

Answer:

189/16 inches squared

Step-by-step explanation:

When you are multiplying mixed numbers it is best to change them to improper fractions if it is easier for you.

2 1/4=9/4

5 1/4=21/4

If you simplify it, it will be 11.8125

Hope this helps! May I have brainliest I need to rank up.

7 0

3 years ago

What is the perimeter?<br> I’ll give you brainiest however you spell it

iren2701 [21]

Answer:

Step-by-step explanation:

The Perimeter Is The Outside length of the shape.

3 0

3 years ago

Read 2 more answers

The radius of a cone is decreasing at a constant rate of 7 inches per second, and the volume is decreasing at a rate of 948 cubi

nadezda [96]

Answer:

Step-by-step explanation:

We have volume of cone as

$V=\frac{1}{3} \pi r^2 h$

and for a cone always r/h = constant

Given that r' = rate of change of radius = -7 inches/sec

(Negative sign because decresing)

V' =- 948 in^3/sec

Radius = 99 inches and volume = 525 inches

Height at this instant = $\frac{525}{\frac{1}{3} \pi (99)^2} \\=\frac{0.1607}{\pi}$

Let us differentiate the volume equation with respect to t using product rule

$V=\frac{1}{3} \pi r^2 h\\V' = \frac{1}{3} \pi[2rhr'+r^2 h']\\-948 = \frac{1}{3} \pi[2(99)(-7)(\frac{0.1607}{\pi})+99^2 h']\\$

$-948 = \frac{1}{3} \pi[2(99)(-7)(\frac{0.1607}{\pi})+99^2 h']\\-948 = 33(3.14)(-2.25/3.14 + 99 h')\\-9.149=-0.72+99h'\\-8.429 = 99h'\\h' = 0.08514$

Rate of change of height = 0.08514 in/sec

8 0

3 years ago