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2 years ago

Two easy seventh grade problems, please help !

Mathematics

1 answer:

N76 [4]2 years ago

4 0

Answer: Step-by-step explanation:

#1. +4.9 +4.9

m/2.8 = _____

*2.8 *2.8 Multiply both by 2.8

Calculate the answer this is your work after all!!!

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3 years ago

A student would like to find the height of a statue. The length of the statue's right arm is 33 feet. The student's right arm

Xelga [282]

Answer:

The approximate height of the statue is 87.945 feet.

The approximate height of the statue is less than the actual height i.e. 88 feet 2 inches or 88.167 feet by (88.167 - 87.945) = 0.222 feet

Step-by-step explanation:

A student would like to find the height of a statue. The length of the statue's right arm is 33 feet.

The student's right arm is 2 feet long and her height is $5\frac{1}{3} = 5.33$ feet.

Now, the length of the right arm and the height must be proportional for the statue and the student.

So, $\frac{\textrm {Height of the statue}}{\textrm {Height of the student}} = \frac{\textrm {Length of right arm of the statue}}{\textrm {Length of right arm of the student}}$

⇒ $\frac{H}{h} = \frac{L}{l}$

⇒ $H = \frac{L \times h}{l} = \frac{33 \times 5.33}{2} = 87.945$ feet.

So, this approximate height of the statue is less than the actual height i.e. 88 feet 2 inches or 88.167 feet by (88.167 - 87.945) = 0.222 feet (Answer)

6 0

3 years ago

Ira Lisetskai [31]

Answer:

a) x+2y-30 = 0

b) 3y = 4x-5

c) y+4x = 14

d) 4y = 5x + 7

Step-by-step explanation:

First find the gradient of the line joining the two points (4,8) and (8,16):

m1 = y2 - y1/x2 - x1 = 16 - 8/8 - 4 = 8/4 = 2

From the law of perpendicularity, m1m2 = -1;

Gradient of the unknown line, m2 = -1/2

Also, the midpoint of a line = (x2+x1/2, y2+y1/2)

Therefore midpoint of the given line = (4+8/2, 8+16/2)

= (12/2, 24/2) = (6,12)

Hence, equation of the perpendicular bisector is

y-y1 = m(x-x1) where m = m2 and (X1,X2) = (6,12)

y-12 = -1/2(x - 6)

y - 12 =-1x/2 + 3

y = -x/2 + 3+12

y = -x/2 + 15 (Q.E.D)

which can be in different forms as follows

Multiply through by 2

2y = -x+30

2y+x=30

x+2y = 30

x+2y-30 = 0

b) From the equation, -3x = 4y+7

-4y=3x+7

divide through by -4

y=-3x/4 - 7/4

By comparing with y = mx + c, we have

m1 = -3/4 and from perpendicularity rule, m1m2 = -1

Therefore, gradient of the unknown line, m2 = 4/3

Hence, The equation is

y-y1 = m2(x-x1)

y - 1 = 4/3(x-2)

open the bracket by multiply its elements by 4/3

y-1 = 4x/3 - 8/3

Multiply through by 3

3y-3 = 4x -8

3y=4x-8+3

3y=4x-5

c) m1 = y2-y1/x2-x1 = 0-1/1-5 = -1/-4 = 1/4

m2 = -1/m1 = -4

Equation is

y-y1 = m2 (x-x2)

y-2= -4(x-3)

y-2 = -4x+12

y=-4x+12+2

y=-4x +14

y+4x=14

d)From 4y = 5x-9

y = 5x/4 - 9/4

by comparing with y = mx +c

m1 = 5/4

For parallelism, m1 = m2

m2 = 5/4

y - y1 = m2(x-x1)

y-(-2) = 5/4(x-(-3))

y+2 = 5/4(x+3)

y+2 = 5x/4 + 15/4

Multiply through by 4

4y+8 = 5x + 15

4y = 5x +15-8

4y = 5x + 7

6 0

3 years ago