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bulgar [2K]
4 years ago
9

Simplify. −7.5×(2−1.9)+3 enter your answer in the box

Mathematics
1 answer:
PIT_PIT [208]4 years ago
7 0
Subtract 2-1.9=0.1
.75x0.1=0.75
0.75+3

-0.75+3
2.25
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Anyone know the answer to this question?
icang [17]

Answer:

1200cm^{2}

Step-by-step explanation:

Surface Area for a Rectangular Prism: 2(lw+lh+wh)

Length = 25cm

Width = 10cm

Height = 10cm

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I NEED HELP BADLY!!!!
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Graph a line with a y-intercept of 3 and containing the point (2, 5).
Lady_Fox [76]

Answer:

Let me know if you'd like me to clarify something. Good luck

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3 years ago
Find the solutions for 5x+3y=30 and 3x+6y=12<br> FAST PLS i will mark !!!!!
Art [367]

Answer:

x=\frac{48}{7}\\ y=-\frac{10}{7}

Step-by-step explanation:

5x+3y=30\\3x+6y=12

Let's solve the second equation for x

3x+6y=12\\3x=12-6y\\x=\frac{12-6y}{3}

Now let's replace this in the first equation.

5x+3y=30\\5(\frac{12-6y}{3})+3y=30

Distribute the 5

\frac{60-30y}{3}+3y=30

Individually solve the fractions.

\frac{60}{3}-\frac{30}{3}y+3y=30

Solve;

20-10y+3y=30\\20-7y=30

Subtract 20 from both sides.

20-20-7y=30-20\\-7y=10

Divide both sides by -7

\frac{-7y}{-7}=\frac{10}{-7}

y=-\frac{10}{7}

Now replace the value of y in any of the two equations to find x.

3x+6y=12\\3x+6(-\frac{10}{7})=12

3x-\frac{60}{7}=12\\

add \frac{60}{7} on both sides.

3x-\frac{60}{7}+\frac{60}{7} =12+\frac{60}{7}

3x=\frac{(12)(7)+60}{7}

3x=\frac{84+60}{7}\\ 3x=\frac{144}{7}

Multiply by the reciprocal fraction of 3. I suppose you know that 3 is 3/1 hence the inverted fraction would be 1/3

(\frac{1}{3})(3x)=(\frac{144}{7})(\frac{1}{3})

x=\frac{48}{7}

5 0
4 years ago
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